Lots of non-techie people rely on their techie friends to fix their broken wifi or crashed laptop for free and us techie friends still do it, sometimes with a grumble, but just as often with a smile. It's great that you're looking to compensate and support the people running these sites and I strongly encourage you to do so, the more you do the more practical and reliable the network will be. I just want you to keep it in perspective that as long as there are techie people out there who like to play with this sort of stuff in their spare time, and enjoy the feeling of "contributing", and believe me there are lots of us, we don't need to live in terror of all the server gods deciding one day that it's too expensive and the whole network shuts down. There will always be lots and lots of people running small nodes and contributing far more than their fair share, and that's okay. While they someday may not be enough to support the whole network on their own, they probably are right now and I think it's still much too early to be alarmed about the health of the network or that there's too much centralization on a few big servers. That will pass, and if it doesn't, you can be sure people will keep relentlessly talking about it, because it's important.