I do not think you can assume that about the seller. Most people know very little about their pianos.
I wouldn't be super confident in this seller because they are providing a very positive report about the piano from a technician. I would contend that most pianists do know enough about their own piano to know that cracked bridgework is a bad thing and ought to be detailed on a technician's appraisal. Especially when they are selling the piano and providing detailed pictures of it in order to sell it. I don't buy it - I think they know this piano needs plenty of work and that it's going to be expensive.
I think it is possible that a private seller may not know much about their piano.
However, it has been my experience in the past, while shopping around for a nice, used piano, some unscrupulous dealers, techs, and resellers will advertise used pianos under the guise of being a private seller, when in fact, they are not a private seller at all; they buy and sell pianos in an effort to make a profit. And, that is not a dis toward good dealers, techs and resellers.
I'm just saying that some used piano sellers advertise the piano as a private sale, but they are actually in the business of selling used pianos. And, they do know about pianos.
Not to keep rambling on, because we don't know all the details, but I too find it very disturbing that the seller touted a very positive tech inspection report on the piano, when in fact it has a serious defect with cracks in the bridge.
If the OP is still interested in the piano, he could confront the seller about the cracks in the bridge and offer a lower price. Otherwise, I agree with Peter Grey here:
Wise to let it go for now. If as time passes it gets sold to some unsuspecting soul who doesn't care, then you have lost nothing. If, as time passes and the seller realizes that it is overpriced but really wants tovsell it, you may be in a serious negotiating position and possibly get it at a reasonable price. I agree that about $6k would be the absolute max.
Nonetheless you should hire your own tech that you know and trust (or that someone you know knows and trusts) to evaluate it for you and you alone. Preferably someone with excellent rebuilding experience and facilities.
Peter Grey Piano Doctor
P.S. Sorry, yonion, I was typing this post when you posted your last post and I didn't see that you had already made a decision... but I did get to ramble on a bit, in my old age...
Wishing you all the best in your piano search, and I'm sure you learned something from this experience!