So, what made JustDice adopt them - what's special about CLAMS?
I like the initial distribution - CLAMs were effectively all pre-mined by the developers and then all given away, to everyone, equally.
Every BTC, LTC, and DOGE address that had a non-dust balance on 12th May 2014 received 4.6 CLAM. There was a little left over, and that was all burned.
After that, CLAM is only created by staking.
This suits my needs at Just-Dice because I didn't want it to get out of hand again like it did when we accepted Bitcoin. In those days we attracted over 60,000 BTC worth of deposits, which is a silly amount to have to be responsible for looking after.
With CLAM there are some 15 million CLAM waiting for people to "dig up" from the initial distribution. The threat of that actually happening keeps the price from going up too much (there are only half a million CLAM that have ever moved, so the unclaimed 15 million is very significant).
tldr: small(ish) and fair(ish)