Which is entirely unsustainable, so not much of an argument against working for another company. If they can offer, say, a million per year, what will the ultimate amount he gets be at 20 years from now? 40 years? Reliability has its uses.
Really, there's no way he's going to accept a job offer in the month where he makes $100+K a day. All Valve has to do is sit around and wait three months or six months or a year or however long it takes for the revenue stream to dry up, and then say "So, how about that job, then?"
Of course he'll probably be rich enough to never have to work again by then, but an offer of his own uber-well-funded development team working on whatever the hell he feels like might well be tempting if he's the kind of guy I think he is.
Then again maybe he'll take the money and retire to bonk supermodels in Tahiti. Who knows?
