Misi v Folksy v Etsy

There seems to be an ongoing debate in the craft world at present... which online retail outlet is the best for selling your wares??  

I personally have both a Misi shop and a Folksy shop - neither of which are making me much dosh!  Etsy seems to be popular but am I right in thinking this is USA based??  I'd have to charge more for postage than I would for the card, hmmm??!!.  If anyone would like to share success stories with their online shops I'm sure we'd all love to hear them....

Having just launched my website I am seriously thinking whether to sell direct from there rather than relying on other online retailers.  If I can direct enough traffic to my website then maybe I will be able to migrate.