Why are Transfomers hard to find?

I really don't get it. I don't see why it's hard to find the toys you want.

I collect Lego, scale models, Transformers and having kids there are a lot of toys my kids want very specific versions of.

The only ones that are hard to get when they come out are Transformers.

With most toys, they become hard to find over time. But when a new Lego set comes out, you can buy it easily online or in person.

I think I literally spent a year of looking at the toy shelves when ever I went into a target to find Cliffjumper. I finally got him today, and the effort put into finding him kinda overshadows the fun of having found him.

I don't think I ever saw Earthrise Starscream. There are now 4 Leader class Starscreams, if I wanted to spend $50 instead of 30. But I never saw the movie master pieces in person. And Hasbro Pulse sells out so quickly.

Amazon and Ebay are nothing but scalpers.

So I just don't get why Hasbro does this. No other toyline has made it this hard to get the ones you want.