As we have seen even the best coins like Darkcoin and Blackcoin can be pumped, but the price is still orders of magnitude higher than the value it was before the rise to fame. You should only really be afraid if a good coin like this is being "pumped" if you buy at the top when the market cap is 50 or 100 million dollars. If you bought early you have nothing to worry about. You could probably buy now and leave and check back in a month and still make a tidy profit even if you miss the peak.

A rich list is pointless. Whales will split their balance into many addresses. Only people who want to feel good about themselves and show off will put their entire balance in one address. Also a lot of people just have a lot of coins on Mintpal and they never see a wallet. Basically a rich list is just to make people feel good about owning what they feel is a lot of coins.