For altcoin gambling, the Y-axis of the "Total wagered" graphs are labelled "Wagered (BTC)", but the actual numbers seem to be in terms of the altcoin (e.g. ETH for dicesites.com/crypto-games/eth). This is pretty confusing!
Also, it'd be nice if the front page showed a Weekly Wagered stat for all sites, in addition to the Top 10 column that's currently shown (or maybe add an option to expand the Top 10 to include all sites). That'd make things a little easier for people who want to compare sites/coins that aren't as popular.