Because it's not fully 'sophisticated' agents, and even though high price is an important factor for purchase, you can't tell your customers 'the price is arbitrary' - unspoken agreement is that price is still linked to inherent value
That's why 9999$ apps don't sell
When waiting in line one tends to mix blame between the seller and the other customers. For high prices, all the blame goes on the seller. You are uncertain if high prices save you time in a given instance, but certain that they cost you money.
The wait-list is exactly a thing they use to raise the price. If it wasn't exclusive it wouldn't be perceived as being so valuable in the first place. Part of what you are paying for is the fact that your social frenemies can't easily get one like yours.
Often it's a scaling issue. If you can raise more capital based on proven demand, you can then fulfil those actual demands for a lower cost, increasing your margins