I still don’t have context.
what’s he selling his bass for? A one-off payment? To fill a deficit? To pay for a holiday?
Technically you’re not covering the cost of the bass, your donating to cover the cost of whatever the bass was going to cover? And without context I can’t do it? What if it’s to cover a mortgage payment and then next month there’s another collection? Solving the root of the problem is going to help more than throwing cash at something?
Also please don’t read this as “I don’t care” I genuinely sympathise with everyone who’s in a predicament financially at the moment, the cost of living is a joke at the moment, my household has had to make a lot of changes too! It does suck.