Show me where you could buy one for less. It's called Supply and Demand. Same reason crappy pizza costs 15$ a slice at the drive-in theater.
Personally, I've not seen one of those before, so it probably is rare. I do agree with you about the "mint" condition. It does not look "mint".
Do you remember the Tomos (for I think 3000?) That was no way worth 3g's cause you could actually go buy one and do those same mods and have the same bike.
I was wondering, it says that harley is under 200cc, but it may not even be moped class. It looks a bit big for 49cc.