At rockfest, one of the guys told the us that if you used a dry rope out 2 or 3 days in regular rock climbing, that it'd lose its 'dry' abilites (because of the wear on the sheath). This sounds incorrect to me because i thought they treated the individual fibers, not just the outside of the rope.
The reason I'm asking is because I need to buy my first rope. I need something for all around use (glacier, toproping, sport, one day trad). I was thinking about getting a 10.2 dry 60m. Is that a waste? Should I just get a thicker standard 60m and a real thin dry 50-60m?