Once free trade comes out all these hoarders/merchants/most owners that have bought the party hats will try to sell them for more. I am assuming 95% of p hat owners hold them for the profits in some extent at least. I would also assume because of this that there would be more sellers selling for a high amount of money and not enough buyers. There would also be a lot of these merchants on feb 1 trying to get an absolutely amazing deal and get a p hat cheaply. Therefore you can assume that the current prices of green and yellow p hats, although currently "bought out", will not continue to stay at this price. I honestly can not see a red p hat going above 600m, green going above its current ge price, and yellow even staying close to its current ge price. All those people with blue p hats are gonna try selling for 1.5bil each or around that much I assume? Who is going to pay it? I would not pay any more then 900-1bil for that, and even still I think that may be slightly high. I think these buy outs for at least up to green, possibly even red are just temporarily artificial prices. All of it now is just hype. You may see an initial rise on feb 1, but how long can they keep these prices? I'm going to assume they will fall after that hype is over, then eventually rise back up as time goes on of course.
This is just my opinion on the p hat market currently. I don't own a p hat, but I am looking to buy one once free trade is out. And to the people saying they will rise, please provide information or logic as to why these will rise without saying "They are rares, they will always rise". This is only true in the long run, not the short term.
Anyway, if you're looking to buy one, it is safer to wait until free trade, party hats can lose value in the short term, coins can not. You are much safer to wait.