OS/400 V3R2 License Keys for hobbyist use

[Scott Quinn]

Doc wrote

> IBM's idea of a hobbyist license is $15,000 a shot.

Just out of curiosity, how does one generally learn these business 
systems?
For MVS we have Hercules, for VMS there's the hobbyist program (and 
either cheap VAXen/Alphas or emulators), but for MPE/iX and 
i5/OS-OS/400 there's nothing. Is it similar to accordion repair where 2 
schools turn out our entire national supply? Or do businesses keep a 
couple of old machines in the back for people to learn on?