Is it a bad idea to reuse Mt. Gox receiving addresses?

I was going to lock my miner into paying to a Mt. Gox address, but I realize that new ones get generated after you use one. Do the old ones still work? And the amounts I'm mining are small anyway given today's difficulty, so we're not talking about gigantic payouts. I think it wouldn't hurt to use Mt. Gox as a medium and to send them elsewhere more secure later.

Let me know if there's a better idea.