https://bitcointalksearch.org/topic/annclam-clams-proof-of-chain-proof-of-working-stake-aka-clamcoin-623147
you can "pool" stake at gambling sites to increase your investment even more.
However if you're looking for a longer term investment, check out nxt.
Staking CLAM is absolutely retarded as you are pitted up against the just-dice.com staking monopoly.
Last I check doog owned a wallet with damn near 80% of the networks total dug CLAM. Effectively centralizing it.
Looking for decent coins to stake? I would look into CashMe: https://bitcointalksearch.org/topic/cashme-cme-powpos-x13-diff-based-rewards-1165889
Don't let the premine fool you. This coin is going to be worth 500% more than it currently is in the upcoming week due to the launch of the dice and ponzi sites that is planned. Investing on the dice site will also be available by the sounds of it as well so you might be able to make mad profits!
CashMe would be another dead coin within a month. Even if you get hold of some of Cashme coins for free, you're shit out of luck because no one really wants to buy turdcoins. Being on an exchange doesn't mean shit if you get zero volumes.