That perhaps it was already done before...

Probably not - absolute standards of living will get even higher, but there will always be things only some people have, and more people want.

(This applies with or without synthetic life doing stuff for us.)

A new twist on the Terminator series. Skynet starts a war because the humans tries something which would influence the stock market.

Come to think of it, not much different to current reality... we already do that to ourselves.