It's a filter for those who are serious enough about their own projects to invest in them beforehand and are slightly more likely to complete due to personal investment from those who are dilettantes and mavens just collecting software they'll never use and polluting the forums with requests for other people to invest for them and do their work for free because obviously you'd want to once you see their genius totally original ideas on game design. I'm not saying that this is the only view or even the right view, but personally I like that there's a bar to entry with Unity Pro. That's what you do already, there is Unity free which used to be Unity Indie, if you can't create a game that will bring in that much with unity indie then you wont with Unity Pro either. The incentive isn't to get extra features from Unity in future, but to be more likely to make your own profit beyond the initial $1500

A huge number of Unity developers who cannot afford Unity Pro get access to it Unity gets paid as quickly as possibly instead of waiting for 50,000 in sales (or whatever the limit is) You get all the great features of Unity Pro up-front to make even better products that are more likely to sell If you make absolutely nothing in sales you pay Unity nothing If you don't ever make $1500 you only pay Unity what you do make up to that amount When you've made $1500 you collect all future profits and owe Unity nothing

You agree with Unity that any proceeds you make from sales of a Unity-Pro-powered product (up to $1500 maximum) will be paid to Unity Tech (they get 100% cut of profits until $1500) Unity Pro is provided to you at $0 cost up-front. Unity Tech should provide a 'Personal License' or 'Unity Pro Credit':

Diverting off from the other thread/poll about getting Unity Pro for $99, here's my suggestion.

Unity pro download