What ships do you ship? If you ship a Corvette for 18 mio. credits, I think you're not using that feature very often. With my 160 mio. credits in my account and a very high rebuy rate, I really think twice if I can afford to use ship transfer. You do it only 5 times and spent 60 to 80 mio. credits? Really, is that how it is supposed to be? How many hours, days or even weeks does it take you to earn that money? It's not balanced. Shipping tiny ships is cheap, I'd do that 20 times per week. But 20 times Corvette is more than I own. So, the feature is blocked for me as it's way too expensive.
as several times said by several posters in this thread, you COULD use a cheaper, smaller ship to PLAY the game without that CR-WALL moving your corvette. a corvette IS NOT REQUIRED to play ED, to take part in a CG, or whatever. i have an eagle, dbs, courier for that case, other posted the suggesting of a specialized viper etc.
you CAN even put together a courier or DBS for a jumprange of >29 ly, and not transport any ship.
but you want to transfer your corvette in no time for no CR anywhere in the bubble.
well, you can want that, but that has nothing to do with general balance of transfer costs and time.
(the feature was originally announced with a vulture. works great with a vulture ;-) )