There's a difference between "fast work" and "a rush job".

I know many people with a very rapid turnaround time and their art is not sloppy nor is there a decline in quality when compared to the rest of their gallery.

I'm honestly baffled that you apparently cannot see what is so wrong with putting out an inferior piece of work - one that had been waited 6 months for - and being snarky about it in the process. Does that really strike you as how a customer should be treated?