In reply to Kaya:
I'm not a sponsored climber but I do know a few. I'm not aware of any sponsors who put pressure on climbers in any way as direct as you suggest. Sponsorship in climbing remains very low-key and climbers just don't get directed like that.
Of course there is an indirect pressure that climbers may feel they need to keep themselves in the news in order to justify their sponsorship, but nothing more than that. Climbers' ethics are up to them.
Photo incentive deals mean climbers may get paid more if a brand is clearly visible in a published photo, but I think the current approach is to keep things low-key and genuine - ie wearing 5.10 boots is sufficient, you don't need a logoed t-shirt, hat and pad too.
If you're thinking of mats as a kind of advertising hoarding then, as a photographer, I'd say its generally pretty hard to get the 'right' logos in shot. Usually there are a good few from the climber and their mates, from a mix of makes. If they have bright colours and brash logos I usually try to keep them out of the frame to be honest. I suspect they are designed to stand out in a shop rather than look good in a photo. If I could choose all pads would be plain dull grey.