Commercial vendors do. It is surprisingly hard to maintain proprietary software for linux, as different versions ships with different shared libraries, have dif

Commercial vendors do. It is surprisingly hard to maintain proprietary software for linux, as different versions ships with different shared libraries, have different ways of doing things. Even maintaining systems that need to run on RHEL 4 through 6 takes _a lot_ of effort. And when you're creating commercial software, effort means time and money.