I wouldn't put it quite as brutally as Fly4Business did, but I've never found PC type sims to be of the slightest help for anything. Actually I've never successfully landed an aircraft with one. It's a totally different skill from flying the real thing. Different story if you can use a proper sim with wrap around screens and simulated motion.
One thing I meant to say earlier is, don't do touch and goes. I don't like doing them now, with 1700 hours under my belt. They put way too much stress into the situation, since you've barely landed and now you have to reconfigure the aircraft and switch mental gears to do something quite different. If you have enough runway, do stop and goes. If not, stop and taxi back. Yes, it'll add a bit to your cost, but as you said you're not really getting value for your money at the moment anyway.