This is no longer my submission (Due to it being changed to a project). I'm leaving this up so reading through the thread doesn't get confusing. (My submission is now Grand Tour; see later)

A couple of things:
1) Thematically nobody wants to give you charity if they know you have money of your own.

2) The "if this card is in play" part is important so the effect doesn't continue after you trash it.
3) Also you can't counterfeit or crown this since the second time you play it, it will trash itself.
4) Not sure if the pricing is correct. I'm open to hear other people's opinions. I'm trying to find cards to compare this to. Closest I can find is Treasury ( it's kind of like +$1 for rest of the game with victory card caveat), though obviously losing the ability to play money is a big consideration.
5) A couple places I could see this working: double tactician, poor house, engines that don't have good enough draw to deal with treasures anyway, rush strategies.
6) I wanted Kudasai's verdict on this. Does this count as a vulnerability? You aren't really restricted per se, but playing treasures defeats the purpose of this card. So in effect, it's a duration that (kind of) prevents you from playing treasures.
Note: This card has been updated
1) so it only works on subsequent turns
2) only works for the 1st buy phase each turn (to prevent piledriving villas)
3) Has while in play effect to get rid of tracking issues