Back on track then, my position, I'm sure I gave it earlier, and I'm not going to justify it, this is just personal preference.
I never DM a game which includes magic shops.
Not ever.
I don't want to play in a game that includes or expects 'magic markets', or even allows the items to be easily made.
I don't want rules to exist to allow for this playstyle. Not even optional rules. Sorry, to me those type of rules send the game in the wrong direction and give players seeds of expectation I don't want them to have.
Is this back on topic enough?