I literally just joined and paid the 5 quid fee, like today.
I'll admit that I came looking for an IPTV sub and found this site. But the fact that you had to pay almost gave me a boost in confidence that the people on this site are more serious. And I was willing to spend a fiver to show my 'committment' and show that I'm not here to waste anyones time. So I don't think its a bad idea, I'd probably see what your registration numbers are like after a month or two and see what the difference is and if the content/activity changes much.
I would also say that a guide to IPTV would be really welcomed, even just like a default template table for requests that you can fill out would be great. There's so much information here and the requests people make seem to be so different to one another, I have no idea if what I'm saying is reasonable or if I look like an idiot