I asked the same question in EQ a few months ago and was approached by a GM asking why I wanted to know. It is an offshoot of why we can't drop cash although we could in classic. It is to deter plat farmers.
There used to be an item you could buy and sell for the exact same amount and I can't remember what it is, and I am not so invested in the idea that I am willing to mine all the merchants to find out.
And yes, the more convenient merchants do not give you a good deal. This is consistent with 1999 and was patched in not too long ago.
And Teensy weensy, that is a great idea, thanks. Brim is no bodybuilder
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-Brimacombe