Some quotes from the thread you linked:
"It’s a rare bike specially with a variated engine"
"Tell him you'll give him$375. Can't lose money on that bike"
"Running that bike is worth over double what he's asking"
"Very Very worth it!! Morini M101 dual variated reed valve!! Plus Colts are a nice frame. Nice find!"
Looks like people are salty they cant score off this older person who doesn't know what their bike is worth. Its a $100 difference, this isn't the same as people wanting $2k for their chazzed out Magnum.
Who's the scumbag here? (edited)