I think the reason that the price is dropping is that not many people like the weapon. People were going crazy trying to get as many as they could before Pyromania ended, claiming they were going to be impossible to get when it was over, but the Rainblower isn't a sought-after weapon. It's massive, it's ugly, and it forces Pyrovision on you. Maybe if these were more desired, it would go up, but I think 1.33 seems fair for now.

Going to agree with Ramirez. I think demand for this weapon is small, and it's a sea of sellers on outpost.

Your personal experience doesn't reflect the entire market. There's still a sea of 1.66 having trouble selling.

That said...

http://www.tf2outpost.com/trade/4632536

http://www.tf2outpost.com/trade/4816811

http://www.tf2outpost.com/trade/4914776

http://www.tf2outpost.com/trade/3931780

http://www.tf2outpost.com/trade/3777132

Lots of people willing to buy at 1.33.

http://www.tf2outpost.com/trade/4949960

http://www.tf2outpost.com/trade/4938167

http://www.tf2outpost.com/trade/4867653

http://www.tf2outpost.com/trade/4950876

Lots of people selling at 1.66.

Having it set just at one or the other isn't right. This range looks like the perfect analysis of it right now.