Great way to not keep anyone in.

People already give enough taxes to real governments in real life. I doubt they'd want to give fake earnings to fake corporations on a video game. If someone said I had to do that to join a corp on Dust, I'd move on.

Donations are the only way to build the corp wallet as of now, for the people who say that if they had to donate to a corp they would leave, that's just one reason they don't hold any standing in PC, or even have the option.

Being in a good corp isn't just a free ride to boost your own stats, its about the team play and advancing the corporation. Money is easy to come by if you don't constantly die in 100k+ gear (I understand that tankers and pilots have a hard time because that stuff gets expensive) but as infantry you can build a very effective advanced suit for under 50k, or even use standard BPO fits and adapt your play style so you don't just run into a group of reds and get your head shot off. If you play as a team and stick with your squad you should still be able to turn a profit.

10% per game isn't that much to ask from your corp members if you are all committed to building the corporation and possibly participating in PC, its also one of the most effective ways of actually funding your dedicated tankers and DS pilots so they can actually run the gear they specced into to help your team on the field.

Sadly, as this is a logical response, it will get trolled and flamed by the idiot masses.
Good day, HTFU, and adapt or die.