We have never been very pushy about the subject and I don't think we really ever plan to be, but maybe a little something that's non-intrusive to help get the information more views would be helpful.
I didn't even know there was an option to be a premium member, honestly the title means nothing to me. The opportunity to support something that I use/visit on a daily basis is worth every one of the two thousand pennies I paid. I think if there was simply a banner or something that showed the option to help support RME you would be surprised. And, in turn help support the 4X4 community.
Plus, RME is way more entertaining then other social sites like Facebook. I don't have to read all of family's drama, (mental) health issues and stupid quotes in between the relevant stuff. Here I go right to the relevant stuff. I cant believe I just compared RME to FB.