Yeah, I've thought about that as well. The main downside is that I'd have to store every entry for every participating player, instead of just the 76–78 winners per draw that I keep now. That would increase the amount of data quite a bit.
I'll keep thinking about it though, and I might experiment with it in the future to see how much storage it would actually require. If it turns out to be reasonable, it's definitely a feature I'd like to add.
RE: How Lucky Are You Really? Fortune Winners Arrive on spl-stats.com