It might not help in the now, but there's always the "delayed payment" method. Go and buy a copy when you can afford it, encourage others to get it

Also, if it makes you feel any better, there's a number of devs who are happy people are just enjoying their creation, engaging with their art. It's great when it keeps you fed, but that's not where the passion to put that much dead time into something comes from. That passion comes from a love and drive for what you're creating and sharing with the world.