Did you expect any less from the masters of copying?
All kidding aside this seems to be a fairly standard practice.
I asked a graphics supplier about making a set of graphics for the Tamjets A4 and was told that since it would be
a popular model that he can do my set cheaper than the normal custom pricing since he would be able to sell
it in some quanity. If they Skymaster had agreed to do a one off they would have charged you a substanially higher price
most likely, then if they offered it to the public I would want to shoot someone too!

Okay to be honest I would be pissed off too! [:@]