Always good to promote these apparent small wins in case the catch on. Do suspect the shift to make, instead of hoping our psychology changes en masse:
Change the model to one of the freebie models that works for high-income earners. High-income earners are OK to make purchases of tangible things where they're promised good is done for the world. Then they enjoy their music and wine (at the gala), or tote bag or whatnot.
We gonna be invited to the first Text Editor Gala?! Maybe not. 50/50 raffle supporting a text editor dev, though, maybe... (ugh a little gambley)
tl;dr give the self-wealth-protecting psychology of the wealthy an out to help them justify their good deed, like NPR sponsor gifts
(to execute - cut some deals with concert venues, restaurants, handmade good purveyors... obtain discounts... then work with developers to set up bespoke relevant rewards for given donation tiers. first part of this plan could be a decent task for the non-developers who wanna contribute to OSS)