I officially am selling across 3 venues.
I promote my personal website the most, these days. I just started posting links to my daily favorites on Twitter and Facebook. And it's the shop that my blog links to (now--it used to link to Etsy).
I don't promote my Luulla at all. I've just decided to maintain it, but I don't think my strategy will change with that one.
I'm thinking I'm only going to promote my Etsy shop if I'm having a sale, or giveaway.
Despite my lax-ness, I've been selling across all three, so for me it's really just a matter of having good pictures and great SEO.
Hope this helps.
Brittany