Premium is only $25 so in that sense it's close to what Multiply charged. Except that there's a 10 gig limit of storage space, which means many of my photos and video wouldn't fit. I'd have to upgrade to something that costs even more.
And that doesn't even include the surveys you can sign up for or the Xangacredits you can buy.
They have a jillion different income streams. I guess it's working for them. They're still going and I haven't heard about them getting bought out by a South African company that wants to change their focus.