Since my buddy Ckdk3 convinced me to use Upstore, I've been very, very happy with all a$pect$ of po$ting. In fact, it's made posting fun for me again.
You can use your earnings to pay for your account and they sometimes have really good deals. As a premium member, I got a 6 month account for 35 euros if I recall right.
I was using K2S for awhile but barely got any sales, which was really suspicious. And they stole the money I did have in my account.
Now compare that to RG. I haven't posted any RG links in a long time but the links I do have posted generate enough $$ to maintain my account and then some.
The one problem with Upstore right now is that it is only allowed as a mirror host, so you would need to use a different host with it, like UL. Hopefully that will change. And if you have a premium UL account, you can remote upload your UL links into Upstore.