None, it's a bloody waste 'o me own time to get petty over the wee difference between "skeptic" and "sceptic".
I don't use it much personally (beyond creative writing assignments and being facetious) and I find it bizarre and unseemly to overuse it...but it's hardly something to get worked up about.
Imagine if all the Minnesotans, Iowans, and Californians [the states responsible for the "smart" American accent as non-Americans know it] decided to sick it on you Euro posters for embarrassingly wrong of American slang.
I don't know what this means. I relentlessly mock the upper Midwestern accent on a weekly basis - it does not come across as intelligent. See: Sarah Palin.