I happened to have some time for playtesting today, and 6$ is definately too much.
You'll mostly buy this card after your first 1-2 provinces, at least when junk-giving attacks are in the set (a card of mine gave out coppers). The thing is, to get more than 4 VP of it, you have to win the province split anyhow. Of course one could say duke is worse (i think i said something along those lines about an older version), but the thing is that for duke you do not have to fight over duchies, at least not with everyone. Everyone fights about provinces, so a duke player might just collect dukes and duchies by himself, while a crown player has to fight. As a treasure it was mostly worth 0$, and did not change the outcome of the game. One player had 5 provinces and 2 crowns, the other had 4 crowns and 3 provinces. Even if the second one had all remaining six crowns on a two player game, player one still wins.
I think those two things are the biggest flaws this version of the card has. It does not encourage going for other cards than provinces (which duke does), and with junking attacks or without trashing, its value as a treasure card is underwhelming. Sorry...