Ask HN: Should I charge for a closed beta?

I'm about to finish an application that I've been developing for about a month, and I have a list of 2,000 qualified leads that are waiting for my application to be released.

My question is, should I charge for a closed beta? I feel like I shouldn't charge for a closed beta, but I also want to have a reward for my hard work, at least to break even with my expenses.

Any advice will be greatly appreciated!