Expensive? €15 is £10... that's cheap!
As for getting lots of orders for the one shirt... we did that a few years back with the first t-shirts. It took 6 months to sell most of them. Just broke even and it took LOTS of work. This way it doesn't cost anything to set up, and anything that is sold immediately gives a little money towards the site.
As for the shirt you ask for; there is a similar one in blue, with larger logo. That no good?
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