I don't know. I tend to be the optimistic and encouraging sort; but in this case I think you already know the answer to your question, and you're just looking for validation.
It's not that you asked the question, because we see this question frequently; but it's the "feel" of how you asked the question.
I think the answer to your question is wrapped up in your reaction to nighteowle's response. If you're willing to throw a couple hundred at finding out what it's really gonna take; then the answer is probably yes, keep the boat because you have a true interest.
If you even think that spending the money on a survey is "throwing good money after bad", then you should cut your losses right now.
At this stage it's less about what you have invested in $; than what you have invested personally/emotionally. If you let it get to the point that your decision is based only on what yo have already invested in $$, then you're paving the road to your own personal boat-hell.
I don't know if I'm being as clear as I wanted to; but I hope I'm making myself understood.
Best of luck whichever way you go ........
I got an Old Fat Boat
She's Slow But Handsome
Hard In The Chine, but Soft In The Transom
I Love Her Well, And She Must Love Me
But I think It's Only For My Money
. ..... Gordon Bok