It's almost assured there's going to be a team in LA though, so if the Chargers and Raiders are priced out, then that just leaves the Rams left.
Again, Houston and the (new) Browns were paying expansion fees, not relocation fees. Expansion fees have historically been higher. Relocation fees are typically below 30M (in fact I'm not sure any have been more than 30M, but I haven't looked that up), so jumping up from 30M to 1billion is quite a bit of an increase when we're talking about relocation.
At any rate, Stan can afford that cost if that is truly what he wants to do. I wouldn't throw out a number, even if it's one as high as that, and then tell him that's what it costs. It's either going to be so high, that he can file lawsuits because it's unreasonable, or reasonable and he'll pay it. Between Stan and his wife, they have almost 12 billion dollars, Kroenke is the 77th richest man in the America, his wife is 95th. Good ol' cousin Jim sits at #7 with 39.8 Billion (which doesn't really factor, but it's not out of the question)... I wouldn't bet against that kind of money if they start talking numbers.