That was just what I was thinking, one beside a retail park?
I worked in a call centre for years, and got bonuses, pay rises, random pizza and days when they'd have a buffet because we'd done well. Sure, it's nice to get a pay rise, but that didn't raise morale within the office and didn't make people think it was a good environment to work in.
Call centres can be extremely depressing if you don't get away from the phones, so even something to get you away for 5 mins can make a huge difference. It can also be difficult to arrange something like a pub lunch, as call centre staff can't just take a long lunch if they want, not to mention everyone getting breaks at different times.
If you're where I think you are, it's not just a call centre as part of a bigger office, you are in the minority not being on the phones. With that in mind, it really doesn't surprise me that everyone is treated the same way as staff on the phones. If it really bothers you, then take it up properly at a team meeting rather than being sarcastic.
As for sales staff being paid more, why don't you try their job for a couple of weeks and see if you still think you deserve more? It's a really horrible job, you're constantly under pressure to hit targets and never get a moment to relax. Having worked in an outbound sales call centre, I'd rather be paid less than go back to that.