I have 3 road bikes. one old friction shifted 12 speed, a fixed gear, and a classic steel frame with modern components. all get used for their designated purpose, the modern component bike is a race geometry and gets used for training rides and racing, the other two are beaters. i take the fixed gear when i don't have too many books to carry, and the 12 speed when im carrying a load (it also has a rack), or just want to take life easy. most of the tuning i do to my bikes is a) general, no matter what- truing wheels, fixing flats, airing up tires once a week or so, and replacing wear and tear items (cables and bartape), or b) a direct effect of my roomate's misuse of the bike. since i hung my bikes in my room and left my u-lock through the 12-speed's front wheel and frame, i have only had to do a single repair on it, other than airing up the tires once a week. that was 3 months ago. well, the front hub hollow axle snapped, but that could happen to any 30-year old wheel. (race bike has the smallest spd platform i could find. he hates my pedals).

proper setup and looking down once in a while to make sure that things are in line really pay off. take time to tune something ONCE and it will pay off in the long run. i have seen so many bikes improperly setup that people complain "i need a single speed. the gears don't work!"

how long did it take you to sort out your chainline on your bike? do you know how to tension the wheel just the right way? its true there is less to go wrong on a fixed gear- pretty much bearings, but sometimes gears have their place.