It may be 'only a fiver' but that isnt the point. I've paid for my computer. I pay for an internet connection. Thats where it stops for me.
Where do you draw the line? Annual subscriptions today, paying to post pictures tomorrow? An extra quid if you post 12 times on a Sunday evening when fewer mods are around?
It also doesnt help that its been free for so many years. If someone told me I had to start paying if I wanted listen to certain radio stations, use teletext or wipe my arse, regardless of the price, they'd get told where to shove it.
And if a fiver is of such insignificance to many people, feel free to send your unwanted money to me. I also accept paypal.