As an OG pirate in my teens and a what elite in my twenties I’ve been spending on average about £50 a month on bandcamp for pretty much all of my thirties.
I do through my purchases and my general encouragement of traffic to the site, if I wasn't a broke graduate student and had the funds to invest in them, without a doubt in my mind I would.
However, even if I am unable to invest in them I see nothing wrong about my expressing discomfort over someone else buying them. I have seen nothing as well that they needed cash to continue operations.