I haven't noticed that thinner tubes flat more often. Sometimes a brand, no matter what the cost, will have a run of tubes that will develop tiny holes for no reason. The biggest thing I see is poor mounting of the valve stem in the tube. When the valve stem fails, it's garbage. Otherwise, can patch. So if your tubes aren't going flat any faster than the next guys, you're doing fine. If not, see what the other guys are using. My current faves are Performance Ultra Light. I used to get Contis, great thick heavy tubes with huge valve mounting patches that seemed to last forever. Nah, they make 'em in China or something now, no better than anything else. Etc.