There are some really duff listings out there - which show little or no detail, especially around potential areas of damage, etc; also, many sellers assume PM = sale.
Is this not the online version of our complaints about so many London bass shops? You can't touch unless you're buying?
I've had a lot of PMs about the two basses I've listed, and I've PM'ed a few people about ones they've had up. It's the equivalent of talking to the salesperson, making sure it's right product for you.
Some people really don't make maximum use of the PM system. I've had the odd one where I've been left wondering what the other person is suggesting, but hey - it's there to be used, it's up to you to make the most value of it.