The problem is usually in the details or lack there of. I find that while sellers usually don't straight out lie, they also do not volunteer information. As a buyer you have to ask the hard questions. No doubt Dave, had you been advised of said issues before you got the bike home & discovered them, you possibly (probably) would have taken it in your stride & still bought it anyway, but as an informed buyer, aware of any niggly issues. It's the nasty surprise that leaves the bitter taste.
K