doesn't sound like it's been all that expensive.
I bought a boat that is now 37 years old. I usually estimate that for any boat I would spend the same amount I paid for her in improvements in the next few years. In this case I was off by a factor of 2
I spent twice what I paid for her so far (and I paid quite a bit for a boat too, it wasn't one of those junkyard cheapo deals).
It's got to be something you enjoy doing and don't feel bad about paying for. I do not - it's something I like and I like spending money on my boat. If you do not - then it's pretty much a given that any amount spent will make you unhappy.
Buying any boat is rarely a good financial decision. Buying an old boat is *never* a good "financial decision".