I think there are several problems with such a plan. One is, very few of us know each other personally and whether or not, the other person's judgment can be trusted? One of the criteria I use here, on opinions stated by TCers, is are they qualified to have the opinions they have. I know it is hard to believe that we have some BSers here, but I think we just might. LOL
For an example, a long way off one. If I was looking for a particular brand and model of a TC and found one on Craigslist in Fairbanks Alaska and called my friend Chuck Johnson, another forum member that I have known for years. If he agreed to go and check out the TC for me and came back saying it was just as advertised, I would be willing to commit to buying the rig over the phone. Because I know that Chuck is qualified to have the opinions about TCs that he has, great skills as a craftsman, honest, intelligent and just a nice guy. Would I be willing to buy the same rig over the phone, on the advice from someone I don't know that is on some sticky here on the forum, no way. I would much rather shell out the bucks and fly up to take a look at the TC myself. Plus it would be a great excuse to head up to Alaska for awhile. LOL
Then we have the die hard brand loyalists. All they can talk about is XYZ brand, which they own, is by far the best and the rest are just junk. Now most of us know that isn't true, many manufacturers have built some very nice TCs and still do if they are still in business. But most of us are not real experts, especially on brands and models we haven't owned in the past. We have TC forum members that are excellent craftsmen and do all their own high quality work, others that I refer to as chainsaw carpenters. Then we have those that are not interested or know which end of a screwdriver to grab. They hire everything done. So before I would trust someone to give me advice on a TC a far distance for me, I need to know more about them.
Then the person asked to look at a TC for someone else may want to watch the issue of liability. You, for instance, ask me to look at a TC here in Florida, which I do, looks good to me, you buy it, come down and pick it up and six months later the ceiling starts falling down and you aren't the least bit happy, with the seller, with me and everyone involved except yourself. Not a good situation, IMHO.