[Q] How much to "donate" topic

I have never had a problem paying for apps or software, 99c to 9 if I'm getting what I need. I have just started playing with my Sprint N3 got it rooted and trying roms which have all been "free"
So what is the "donate" amount? I have sent a few to out but really have no idea, I did search but found little. Some of the work the devs do is a little bit like magic to me and a couple of threads here have saved me a lot of pain.
I know the answer is whatever you like or think it's worth but I will go broke at that rate.
Thanks to all the people that contribute Andy

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[Q] Can you donate a build.prop from a Rogers G2 topic

I am looking for the stock build.prop to a LG G2.

(d803r10c)

If you can pastebin yours it would help me immensely.