I know I do this a lot for many shady sites on the internet, so I might even be one of those people. The only reason why I do this is to protect my main email accounts from becoming a spam nest.
There should be some rule enforced that all accounts with no activity for say 10 years should be closed down and all money on those accounts be transferred to the faucet or lottery pool for a bonus draw.
If they don't check the email they used then they won't see the notification of the win. I don't think we could really introduce a rule like that retrospectively. If the coin just sits there unclaimed that actually helps us as it increases the size of the bankroll which in turn allows us to have a larger maximum win on the Hi-Lo game (currently 20 BTC which is competitive with other dice sites).
Yeah, that's always been an unfair rule - retrospective or not. We all have been there, leaving accounts inactive inadvertently, I know it's happened to me more than I care to remember. Could always make them tagged as dormant, requiring reactivation, but never to confiscate monies that are simply left on accounts. It's not really like they're taking up so much resources, are they?
@kakmakr, I use plenty of throwaway emails too, but if I even had a small chance of winning a lottery, I'd use an email I could at least check back. Freebitco.in is whitelisted from my email haha.