I don't really know mambo but I do suggest having some sort of Content Management System as postnuke or phpnuke. You really don't need to know html at all to work those sites. Maybe start up a photo gallery or chat room or simply offer more diverse content and do what you can to build the site beyond your friends as their likely the most unreliable members you'll ever have, no offense, but it's true.
I have a few close friends that are on my sites and the rest are people they know with similar interests. I used to have many more friends on my sites but they rarely visit.
Also, load your site up with fresh content daily, spam your own forums, get things rolling. Your only going to get out of it what you put into it IMO.
Do you have a link to your site so we can see it?



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