just to throw an opionion into the mix:
i get that/why people would lol at the idea of paying for something as "trivial" as a config for some game, but that's really just because we've been spoiled by those capable and willing, like Chris in the past with the famous chris' config.
it's pretty rare for knowledgeable and clever people like chris, mastercoms and setsul to spend time helping a bunch of average gamers like us (yes), and they will be moving on at some point, and you never know if there'll be a replacement any time soon.
i wouldn't push or even recommend anyone to donate, but don't forget that a lot of time goes into stuff like this, and the majority of gamers are nowhere near capable of producing configs like this.
and let's be real, we've all spent hundreds, if not thousands of hours in tf2 using configs that people like mastercoms have made.
just don't take it for granted, peeps.
as for ways of payment, i've always preferred simple one-shot paypal donations so i can decide what i want to pay/can miss, and later i can always come back and put in extra. i realize that might not be ideal for someone putting in time consistently, but i think it's safe to assume that some might not bother with patreon at all, while they would consider something like paypal. (just a suggestion to have that as an option as well.)