I was in a UAS whilst at Uni. It was pretty good fun. While I was there we did bitch ever now and again about the below national wage limit, but then we'd go out for an hour of GH.
I walked away from the UAS after completing EFT with over 120 hours. And all this was free. In all fairness, we are getting alot more training (more expensive at least) than the OTC. So complaining about pay is just greedy.
Take as much as you can from the UAS, ask for a sevice discount book to see what you're missing out on. You can save money on almost anything! So you don't really need to get paid more now do you!