Since you've quoted Patrick Leach as an authoritative source in this thread (post #10) let's see what he has to say about those Stanley transitionals...
"worth obtaining to practice your restoration skills"
Hmm, that doesn't sound so positive, but maybe if we go further...
"A certain plane sect, located in the northeast, practices a bizarre and ritualistic ceremony where transitional planes are set aflame a la a funeral pyre. Whether it's in homage to Leonard Bailey, to appease the spirit of Justus Traut, or is symbolic of the sect's mission in life to turn old tools into cash, no one knows for certain. Regardless, it's a sight to behold, and not to be missed, given the opportunity to witness a Trans-Ferno immolation in person."
Uh oh. But maybe...
"Burn... Baby... Burn... Transitional... Inferno"
Well, there you have it: Suitable for practice and immolation.