I'm only publishing on two websites at the moment: www.hipcomix.com and www.mccomix.com
Some comic stories are setting in the same universe but they're always independent as both sites are focused on totally different thematic. Nodoby needs to be subscribed to both sites to enjoy the comic stories, even when both sites are part of a same website ring.
In the other hand, I'm planning to add a comic store on my website for comic sales. There anybody will be able to buy the complete chapters of some on going stories, months after their publishing on HIPsite ring. That way anybody is happy, I sell my stories and if you want to see the newest chapter you must stay subscribed.
I've got two chapters ready and I'm searching for the appropiate store to sell them.