Your first issue was participating in Facebook.
Second, Dan's right. Groups like that draw from all walks and most people buying a scooter are not doing it for the vintage aesthetic or for the opportunity to rebuild a motor.
Here in NYC, as soon as my garage gate opens and I roll the bikes out I get people asking if I work on/sell scooters. The other day someone walking buy asked how much I sell them (mopeds) for, and I replied "between $1200-1400, depending on the bike and what work goes into it."
His response: "Yeah, well for that kind of money I'd rather just get something with a real motor."
Me: "These all have motors..."
Him: "Oh, I thought you pedalled them to charge the battery."
This is the type of person who will by the Qigong Speedway R50 SuperSport Ruckazoid off of CL and be asking in two weeks why he has no compression after "derestricting" it and swallowing a valve.
But seriously, get off Facebook groups for Mopeds. While MA isn't area- or make/model- specific, at least all the posts and info is searchable and databased, and you will get actual good, if critical, answers.