Well; its not as easy as you think, I figure you are one of those really smart people that can't comprehend people that aren't oriented to electronics like you are therefore you don't understand why they can't do it.
Constructive marketing; I think there's a large market of people that would like to put a kit together without knowing much about electronics. It would really help if the thing didn't need any fancy tuning equipment like a oscilloscope. They're the people that just like to put stuff together and don't have the interest or time to study electrical engineering which is pretty deep stuff. I've scraped the surface with my mental shovel, saw the thick soil, and put the dirt back. But I have money and would like to buy things. If there was a kit out there that had a modular design, like the option of a VFO vs a crystal, a wound modulator vs. a PWM thing, maybe a bluetooth receiver to transfer the music, even the option to add SSB, and of course a powerful amp to top it off. And make the thing usable on different bands to expand the market to hams, THAT would sell like hotcakes. And it kindly introduces newbies into the art instead of scaring them away with advanced stuff.
Here's a cool transmitter here:
http://www.tentec.com/?p=1456, you can plug in a little screen to the arduino part. But you need to ad some software first. People like plugging in stuff to make it better.
The bass; so if I play some rap music with heavy bass through your setup, the amp isn't going to shut off?
Feat of strength; I bet if I took my transformer by the wires, swung it around my head, and whacked your transformer with it, mine would still work and your'n would break.