What ? Your shocked that your brand is not strong enough to warrant £15 for a mug ?

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I think best you concentrate on making this site better, getting more new users, than "mugging off" your existing users to the tune of £15.
I mean, a customised Bentley mug "Add your name here", is like £6.99 delivered.
Working on the basis that your brand is nowhere near Bentley's, then you should be paying us to receive one, or wait about 150 years to get there, and that's if ya lucky enough to find a few people willing to put their favourite brand of tea or coffee in it, and have to look at your logo while drinking!
Most people think there brand is far better than the perception of most normal people, and go down the track of wasting tons of money on mugs, pens, badges etc. The only use of ALL of these crappy items is to give em away, (Most end up in back of a stockroom) with the hope that one or two people actually visit a site with some interest after reading the advertising on these items.
The most useful freebie ever, was a free car rear window sticker given to every purchaser of a new Porsche, already stuck on, by a dealer in London during the 80's.
The sticker said "My other car is a Porsche".
Note !
To thiose not born in the 80's, it was common for every driver to have a rear window sticker. Most of these "My other car is a Porsche" was stuck onto, vans, Ford Escorts, crappy cars etc.