In all honesty, as long as I can continue to find pubs willing to let us rehearse in exchange for some gig time, I don't think I'd go back to using a paid-for practice space.
As a small-time working band the amounts you have coming in are fairly pitiful and to be handing over £30+ a week eats onto it considerably. The convenience of having a PA, a sofa and a vending machine are nice, but it's not really a great hassle to throw a powered monitor in the car, especially when you're moving amps anyway, and having a pub downstairs usually means refreshments aren't a problem.
Obviously mileage varies and this is just me, I know some musicians who've never made a penny who wouldn't dream of doing without a proper rehearsal room.