This is like a textbook example of a
slippery slope fallacy. There's no proof to show that SE intends to ever add anything but 100% cosmetic content to the cash shop, and in fact they've said multiple times that they're going to be keeping it that way.
The thing is, giving 1 or 2 extra retainers to every single character on every single server would surely add up to more space than only adding for those that are willing to pay for the service. Think about how many people have alts - I doubt that very many people subscribe to extra retainers for each alt (if they subscribe to retainers at all, since you can use alts and the FC chest to list and/or store extra items for you). Don't get me wrong, I'd like more retainers too. It would give me even more market presence than I already have. The only problem I'd have is keeping a supply of venture coins on hand. :3
I don't see how glamour items and mounts are "disgusting" but that's your opinion and you're welcome to it. To me, the only types of things that would make the cash shop intolerable would be if they affected actual game stats, exp gain, or access to areas.