I don't entirely disagree, but I have noticed at least on SmokingPipes, there's some tins that do have a limit per order due to supply.
I think it's a real dick move to spam refresh when you know something is coming out that will be limited and snatching up as much as you're allowed with the sole purpose of trying to flip it at gouging prices when the stock runs out. People did that in the early days of the pandemic with sanitizers and stuff, some of which got burned as they were banned from selling on Amazon and other places and got stuck with thousands of dollars of product they'd never use and can't sell. I think with things considered necessities, it should be a punishable crime, but tobacco isn't a necessity. When it comes to non-necessities/luxuries, while I think it's a dick move, it's really up to the sellers and the market to figure that out.
I don't know that there's much that can be done about that, there's always going to be someone that wants it bad enough and willing to pay 2-10x the market value, so it's always going to be worth it to people to try to scalp the stuff. Unless everyone that used pipe tobacco agreed to never pay scalped re-sell prices, people would stop doing stuff like that. But that'll never happen.
And certainly even if they limited purchase to even just 5 tins of stuff like that, it would still sell out probably almost as fast because there's enough people trying to flip a quick buck.
Fortunately, I wasn't interested in that particular blend.
I suppose one option is to find some way of tracking your loyal customers, and giving them exclusive opportunity to buy first before going to market, but that's up to the maker and sounds like a onerous task that wouldn't be worth the effort.