If the subscriber service you talk of Roxy had more benifits i would be interested in the idea, but at the moment no.
The only one i would see as benificial to PC is the interview thing, i dont just think Mod's etc... but also members to get to know them more (There would have to be stipulations, such as a member has to have over a certain amount of post or whatever else interviewing a 2 week old member wont be interesting and wont work.
I dont see why everyone bangs on about Signature sizes. It doesnt interest me in the slightest, i think they are nice to look at and some people have some great ones which makes PC better but having them bigger wouldn't be a main point. I'd welcome maybe a change to 400x150 but i dont care in the slightest if it gets decreased or increased or stays the same