I agree with all of this, except that the biggest money in esports indeed does come from PC-based companies, even if they aren't manufacturers. The prize pools from companies like Valve are still head and shoulders above everything else, and all of the truly big-money esports (League, CS:GO, Dota) are played on PC.Because they aren't as practical for running large FGC style tournaments. Most big PC game tournaments, you only really need 10 to 12 setups, 5-6 for each team depending on the game. Compare to something like Evo where you'd need a magnitude more than that.
Then there's the fact that setting up on PC isn't as smooth as on console. It'e generally easier to just plug things in and play on console, compared to PC where you have to deal with drivers, as well as XInput vs DirectInput shenanigans.
Finally, big money doesn't just come from PC manufacturers anymore. In fact, as eSports grows, the bigger money coming in is from companies that traditionally aren't related to, or are only tangentially related to gaming. For example, Red Bull is one of the biggest spenders in terms of eSports sponsorships, sponsoring not just players and teams, but even events (they certainly sponsored my event, Manila Cup, last year). If eSports continues to grow at the rate that it has, then pretty soon we'll start to see even more "mainstream" sponsors.
Even the prize pools from something like Intel Extreme Masters will still outstrip most RedBull-sponsored events.
This isn't particularly relevant to the fighting game community, though.