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The question and the post don't match each other at all. I'm not even nearly qualified enough to tell whether x86 is better than the alternatives, but I know for sure that development costs have been rising for a long time (probably since the beginning). The reason is simply more powerful hardware, which enables more advanced games, which in turn require more people to work on them, which costs a lot of money. Whether x86 was a better choice than say, PowerPC, is another question, but familiarity is definitely a factor that should reduce the costs. Now that there's only one architecture to master instead of two (last gen we had x86 for PC, PowerPC for consoles), the situation should be better unless x86 is vastly inferior, which I strongly doubt it is.

So, to answer the question, at worst x86 is probably not much worse than PowerPC, but at best it could be a lot better. Reality is probably somewhere between those two ends.