Not all "premines" are necessarily bad. Not all alt-coins are crap. Let the market decide.

I'm wondering how much Solarcoin is a factor in this myself.

Listen, there's no perfect way to do this.

Yes, premined coins which are held in reserve can make a coin appear higher in the rankings. However, that's really irrelevant, because if all of those premined coins were dumped on the market at once, the coin would drop to the bottom of the rankings.

There's no way to know how many coins are available. You just don't know who owns them and what their intention is.

You can look at the blockchain and see total supply, and you can look at the exchanges and see price. Everything else is conjecture.

Sure, make an option to filter out coins with sizable premines, just like you can filter out non-minable coins.

Coinmarketcap is a cool site and I check it daily. Keep up the good work.