Would a second bachelor's in art be a waste of money?

So I had a windfall... I've always thought about going back to school. I'm still a novice at drawing and I'm early 40s if it matters.

It'd be 12 courses (36 credits)... like $25k-30k.

I'm not doing this for career, more as a hobby activity (although I do aspire to eventually sell or get in a museum) :)

I know online courses are far cheaper (I'm working on one by Proko as we speak). I guess it's just funner to be with other students (although I'll be older). Also would get feedback from instructors. Also easier to stick with something if it's school. Lots of benefit to being in school.

Another option is continuing ed for adults but I think I'm more of a serious student.

Not sure if I should do this or aim for a master's (already have bachelors)

Thanks