My front tyre is wearing out faster than the rear

Now I've checked tyre pressures and looked for clues on the tyre as to why this should occur but can't find any.
So yesterday, I popped into a BMW place and asked them. They didn't know as they'd never heard of this before.
One bod suggested I stop doing stoppies, but I said the bikes got abs so unless I turn it off (not likely, unless I go off road) it can't do stoppies.
So any suggestions apart from the only one that I can think of (substandard tyre)?