I personally think RB are leaning on Mark so they have a reason to drop him for '12. Seriously, Mark's KERS never works and Seb's is faultless. Race after race. A $500 Million F1 don't carry a spare KERS battery. Unless you're German and will sell Taurine by the truck load you haven't got much chance in a team that's little more than a marketing exercise.
Can everybody please stop with these ridiculous Red Bull conspiracy theories? For a start, it takes two cars to win the constructors championship so why on earth would Red Bull shoot themselves in the foot and deliberately sabotage their chances of winning it? Secondly, Webber is only on a 1 year contract anyway. If Red Bull want rid of him next season, there's nothing stopping them.
Nobody wants to admit it but it's a lot more likely that it's Webber himself who is f***ing up his chances. He's not exactly a big ray of sunshine these days and the frustration of missing out on the drivers championship last year is bound to affect him hugely. Some drivers use that sort of emotion to inspire them, others find the effects are a lot more negative. Webber appears to be in the latter camp.
He's been outqualified by Vettel now for 8 races in two different cars. We can go on all day about it being some sort of twisted plotting by RB but at the end of the day Vettel has youth on his side and a driving history that is filled with a lot more success than hardship whereas Mark has spent so many frustrating years at the back/middle of the pack that his eventual brush with glory at the age of 34 would have seemed very alien to him.
As for the advertising/Red Bull marketing angle, I tend to disagree as well. Yes, Vettel being a young scruffy daredevil, fits into their marketing profile perfectly however they do have that section of the market substantially covered by dozens of extreme sports stars (e.g Travis Pastrana and the whole Nitro Circus) Mark Webber (and F1 itself) is another avenue that gives them exposure to a slightly more mature market and no company is going to deliberately ignore potential customers...