Giving up on the sleep training for now

I'm tired and the extinction method doesn't seem to be working :-( Probably because I'm not doing it 100%. We've been letting him "cry it out" in the middle of the night for 4 nights now. Each time he has cried for 2 hours and then I decide well he is probably hungry now so I'll get up and feed him. I think I will try again at 9months, but for now it's easier to wake up once at 2:30 and put him back to sleep than wake up at and listen to him cry for 2+ hours. Anyone want to convince me otherwise? I'm open to suggestions :-)