Perhaps for entertainment assuming there is nothing else to produce in the real world under it all. Bostrom thinks the odds are still less than 50% since it's much more likely any given civilization would die out long before it can produce a simulation of sufficient detail. Something capable of tricking not just personal impression...but it must also consistently fool all scientific measurement or research as well.
Is our life experience nothing more than a reconstructed memory in a moment?
The un-falsifiable nature of these assertions places it well within the realm of religious thought. For example if anyone ever did figure out some proof we're in a simulation, the simulation could rewind, edit, and replay the moment to remove the consequences of the discovery and all memory of it and then replay an adjusted model. This in essence means we don't really exist at all.
Cause has no effect. That in a simulation we are as fictitious as the fiction around us. We are in other words...already dead assuming we were ever alive to begin with. The experience of life would be like a download, not a dynamic, organic, productive moment building on real results of past moments. Momentous progress would be an illusion undermining the necessary steps to produce anything at all. Another paradox.
Computationalism is a philosophy of mind theory stating that cognition is a form of computation. It is relevant to the Simulation hypothesis in that it illustrates how a simulation could contain conscious subjects, as required by a "virtual people" simulation.
There's a classic paradox, for example, with religion that says if god made the universe then who made god, then who made who that made who that made who...to infinitude. Simulations stack forever in a similar way. The high order bit of course being the implied meaninglessness to every single moment of our experience. If we're in a simulation then we literally don't matter at all. No more real or capable of effecting real things than a dream character. Even relative value disappears in a system that can cheat cause and effect.
There would be no time. There would be only one moment. One single moment that reconstructs the "reality" of the universe we measure and describe. The reality of any world only makes sense through measurement. A world that can't be measured is beyond reality. A world were measurements are only giving false, programmed values isn't capable of producing original thought, therefore a simulation would fundamentally restrict its participants from actually thinking. So if something can't think, then it isn't really experiencing anything. It's not really alive. It can't produce more than it consumes. Technically, it can't even consume. It can only be consumed...by the simulation.
Simulation Theory is Atheist Heaven and AI is Atheist God
So you see simulation theory isn't bullshit because it's improbable. It's simply noncompetitive against the real world it would have to be built upon. It's very meaninglessness and lack of comparative production value would soon make it redundant and pointless. A liability. Entertainment has very short shelf life. The limiting principal of simulated capitalization forms a finite pyramid of diminishing returns. The theory can't hide from the run away inflation caused by the inevitable increasing cost of participating in deeper and deeper simulations.
Everything is more expensive the further we are removed from the real world. This applies even without simulations, just our own everyday misconceptions of whats happening around us. The closer to reality our decision making is...the more profitable. That's why science is so powerful.
We would have to assume there is at least one true universe that produced the first simulation beginning the chain of inception. That universe would remain the only real thing. Those within it would be the only living things. The changes made in that world would be the only real changes. The production of those changes would only effect the real world in which they are ultimately responsible for because any effect to the simulations are reductive.
Even a million simulations stacked within a million more would be no more meaningful than the dreams we all share every night when we sleep and yet brutally expensive for the real world to maintain. If the simulations stay around one or two layers deep and we don't sever our connection to the real experience that underpins all this then perhaps they could be used as tools to help produce results in that real world. Influencing our real actions through a beautiful fiction; however we must not be fooled into thinking that fiction operating within fiction can produce anything other than more fiction and resource depletion.
You twitterverse creatures might want to keep that in mind.
Anything that consumes more than it produces dies which is why Simulation Theory is a pyramid scheme.