[Sef]

In 6 months the price of Party Hats will be near zero, or as close as makes no odds. As for how they impact on the economy, in the first few months of a game there is no stable economy and things will fluctuate wildly. However, everything will settle down in a few days, currently everything is in OMG PHAT mode.

Mat.

Jagex Mod Mat K has confirmed that the party hats will be worthless. They will be dropped every year. If you have any party hats, I suggest you to sell it since it will drop very, very low. If you only have like one party hat, you can keep it if you want to, so you can still look sexy and stuff. But if you're hoarding phats, sell them.. (This isn't only for party hats, all tradeable holiday items won't be worth much like h'weens, pumpkins et cetera)