I'm never normally one to look a gift horse in the mouth, and whatnot, but anyone using a cardcover is going to look like a right old tösspöt
Wouldn't a small amount into a poker.co.uk account be a better reward, and also encourage the glorious victor to push a few more of their pennies into it as a result?
Obviously, I don't know how much the cardcovers cost, but from previous experience in the world of t-shirt manufacture (well, I printed up a run of 50 once), I'm guessing that your esteemed navy blue apparel will have come to about £4-5 each, and I'm sure people would snap your arm off at the thought of even a nominal $2 prize.
Then again, not everyone has internet access, and of those who do, there will be those who haven't got the inclination to spend hours prone in front of their monitor, watching in an ever depressed fashion as their pocket aces takes a beating from a spotty Swede who has gone all-in 8/9 suited pre-flop.
Card covers it is, then.
Cheerio,
Ian