Sort:  

Yep 10:1 would be good, i was just thinking theres about 3m BTC unobtainable for one reason or another, but estimates vary . So the ratio probably will end up higher than the max circulations suggest.
You any thoughts on which coins might be added to coinbase next ?

Very good point, but I also believe there are probably a lot of Litecoins that are also lost forever, maybe as many or more than Bitcoins...

I wish I knew what coins would be going up on Coinbase next!
Pure speculation, but I wouldn't be surprised if they release their own token, sort of seems to be the thing to do these days....