Hes not really talking about sponsors much the way most people think of them. He's talking about professional companies that post their flash on the site.
Its just a hard thing to judge what is 'professional'... even some of the amateur artists/devs here eventually do go pro, should the site close its doors after nurturing them? no.
'There she is' is made by a team of animators who from what i gather, work professionally. Should they not be allowed to show their work here? Should they be stashed elsewhere? The answer is no, its a competitive market wherever you go and whatever you do. Some of the funnest games could be the most crude, and some of the most ellaborate ones by the wealthiest companies could still fall flat. You should just not worry about it and go at your own pace and skill level.