Burris Zee don't cost any more than Millett angle-locs, and are far far better.
Excellent point!
Besides, those are two completely unrelated subjects. The issue olyeller brought up is can you/do you make money on gun accessories? Regardless of which type is stocked, the answer is yes, you do; that's precisely how you make money. As to what to carry, I suppose it's a function of what's the most profitable; maybe the markup on Millett's is higher than Burris Zee, even if they sell for about the same - that'd be my guess. But then you gotta look at whether they're selling. I guess I can see why it's happening if the margin on Milletts are higher. 99% of people buy the cheapest (as you say), *among those that are in stock* - so just stock the Milletts & make more money, until people find out that you lose your zero every time you tighten a screw, and then people go buy a substitute online (but you've already sold the Millett). Still, if you offered the substitute ALSO, then you could ding the customer twice, if your only goal is money, not satisfaction for the customer.
You used the word "guess" a lot which is the problem. You don't know that the margin on Millett is better then Burris. I'm not sure why you even keep using those as examples? I don't sell cheap stuff and listed two of the companies I do sell. Where you got off on this customer "ding" stuff and satisfaction is beyond me.
I'll state this again. The majority of the shooting community do not buy the most quality stuff and do not shoot a lot of rounds. So your point about them not holding zero is worthless because the vast majority will not even notice it because they a) don't shoot enough or b) won't spend even more money to replace it.
If you want high quality stuff there are local people that can get it. You just will not find anyone that has a "selection" on hand because as two people who are in the "business" just told you.... they don't sell well. So you have two choices... either order from an online retailer or talk to a local shop and have them order them for you.