Hey man. I know some people don't like the idea of putting donation links on their site because of multiple reasons but I really think you should do it. Not for what you'd think though.
I really appreciate all your hard work but because there are multiple hands on the pot it may seem unfair in some ways to send donations to only one person even if you are one of the main coders of the project.
My idea is that there should be a donations link that should pool up in some place for you to save up to buy 1 of each kind of router that is supported by your firmware builds for testing. Also maybe you could make a link to a list of every router you already own in case someone would like to go as far as to donate an entire router to you.
I know you could just have everyone out there that owns one test for their selves but I really think if you had 1 of every type of router it would really launch production forward because you could quickly find bugs without relying on others to give you data. I'm all for whatever makes your job easier so that we can continue to get these awesome updates.
Not to mention you'll have your self a nice little router lab out of it… :-)
I honestly think that after all the work you've put in you deserve it anyways.
My idea may sound crazy but who knows…