Ooops I figured you were joking about the price part. I'm not sure if I've ever seen fruit trees in huge pots, so wasn't sure how transplantable, or how fruitful they would be at that state. Is root pruning required?
As a general rule,
Yes root pruning is required,
but this can be avoided, if you constantly repot the plant before it becomes root bound...but I always prune roots to some degree.
And plants can be put right back into same container if root pruned (especially if you start by setting the plant in the pot, quite low, at an early age...you can step the same plant up, in the same 25 gal pot, about 4 times, just go higher up each time!
Good luck, maybe more will realize the benefits of container culture!
I have a presentation I did about his just a month or so ago...if you want a link let me know.