We subscribed to F4 for a while, until we realised that £5 a month for a huge pile of unwatchable, pretentious twaddle was not good value. Even Mrs T was disappointed, and she did Film Studies at uni so that sort of film should have been right up her street.
I wonder how the economics of that works out for Channel 4 - £5 for (IIRC) three channels, to completely free? Must be costing them a bit. Unless no-one is subscribing to it anyway, in which case it's probably a good idea.