How is that any more ridiculous than a three button suit on which you can only button one button?
It's acceptable to only button one button on a 3B suit--in fact I wouldn't button any more. It's considered vulgar to leave your sleeve buttons unbuttoned. If you're going to do it, you should have a choice. I wouldn't buy a suit if I couldn't button the sleeves and look like I knew what I was doing.
The service sucks at Zara though, everytime I ask if they if a size is sold out they are like "mmm I don't know". The lazy bastards don't even check in the storage. Besides that, they do have decent stuff from time to time.
Heh I'm pretty sure if it's not out on the floor, they don't have it. I think the behavior you're talking about is generally prevalent at all mall stores, but is more indicative of the person that you're discussing than employees at all stores in general.