Bills don't stop existing because I choose to eat a watch a sunset, either, but I don't ask if watching a sunset is going to pay my bills. People obviously need a way to pay their bills, and lots of activities they might engage in aren't part of that. If you aren't in a position where you can do an activity because of what you need to do to pay your bills, than that activity clearly isn't for you, but unless you were personally and specifically solicited for that activity by someone who should have been aware of your personal circumstances, I don't see how that warrants anything besides "well, that's not for me".
Your circumstances aren't universal.
Take your socioeconomic bigotry and shove it up your priveleged ass.
A particular volunteer opportunity may not be interesting to you, because of the time commitment and the opportunity cost of sacrificing paid work, or because you aren't interested in the particular area of volunteer work, or because you just aren't interested in donating labor in general, but... so what? The posting of the volunteer opportunity isn't a personal solicitation aimed at you, either.
There are some things that are too much work for anyone to call it merely volunteering, and should be compensated. I don't care if you find that opinion acceptable.