Some thoughts.....
There are free punk gigs in Norwich quite often that you're already competing against (dunno about ska/metal etc though).
There is a mental barrier between 3/4 quid, you're right, although there's also probably a barrier between free/paid gigs, that doesn;t seem to be affecting you!
Could you have the £3 just for the punk gigs, which there's more competion from free gigs and you're more likely to get people playing free/cheap IMO, and charge more for metal or ska gigs?
How much do other people charge at The Cricketers?
What you're doing at the mo is working, do you wanna alter that/ you're atracting good crowds and making good money.
You could try it and go back to £3 it if it doesn't work.
If you're going to be spending the extra money on getting better bands, this surely means you won't be making any extra money? Unless it's because you're running out of decent local bands?
It's very cool that you're taking a bit of a break 
The gigs are well cool and always seem to be a sucess 




This is a thread I have also posted on Norwich Darkside:
I've been doing a regular punk and ska (benefit gig) night on the first Friday of the month at the Cricketers Rest since November, always charging £3, booking (though not always getting!) a band from out of town or two plus having quality local supports/headliners. Now I'm taking a 3 month break from Righteous Fridays from June until September. I was thinking of maybe relaunching it with £4 for the night, but with £100 extra budget for bands. Given that turnout is mostly in the region of 100 @ £3, I reckon the combined stature of the expensive band(s) should maintain the turnout giving me this extra £100 to play with, but I'm not sure, and want your ideas! I would most likely still go for having only one or two out of town bands - except I'd be able to afford bigger headliners.
How much difference does that extra quid make? I've always thought that £3 was the upper limit for a cheap gig - I'd happily pay that without thinking, but £4 seems to kick in the cheapass monitors in my brain (not as much as £5 does, but they start working!) This always seems a bit ridiculous in the face of the fact that people happily spend £3 on a pint and that a quid in the scope of a night out is barely anything. Anyway your thoughts are very much appreciated!
(And any feedback on the gigs or whatever is good too while you're at it!)