Might be a daft question, but looking at how long you have been here and how many hubs you have published, I can't see why you don't make ANY money unless you never signed up with Adsense as an affiliate. I can't say I have read your hubs, but unless they were really poor quality you should be making a small income by now, even if only a payout ever 2 or 3 months from Adsense.
My advice would be don't stop hubbing, sign up with Adsense if you never did before, revamp your existing hubs and write further hubs of a high quality. 25 to 50 hits is very low, so you might want to check out if your hubs are long enough, spelt well, grammatically correct and accurate. There are loads of great hubs full of advice on improving your traffic if you seek them out and follow the advice they contain.