you're more than likely correct.
Bulkhead rot, and even the compression post are not that big of a problem. If you can do the work yourself, so much the better. (bulkhead replacement, 4 day job, 2 to remove, 1 to cut a new one, 1 to replace and finish.
If the compression post is bad, check to make sure the deck hasn't sunk, or the sole hasn't receded. If not, knock yourself out with some good wood replacement.
Don't let it be a "deal breaker" if the deck is dry, and the boat is in otherwise good condition & good price.
We are not primarily on earth to see through one another, but to see one another through
Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs