Just my 2 cents but I really don't think anyone makes a serious decision based on a given mascot. If someone loves a product but hates the mascot, they will probably still use it, but if they love the mascot and hate the product, I can guarantee that they still won't use that product. In the end, mascots don't really matter IMO. As for Tux, I think that most people would consider him to be "cute" (at best) but only "neutral" (at worst).
As trickykid already mentioned, if mascots did affect the ultimate success of a particular product, launching a full blown advertising campaign featuring full grown adults wearing skin-tight blue leotards while dressed up as butterflies would probably be considered the most misguided marketing effort of all time. -- J.W.