Re:times as much testing? (Score 1)

You're completely wrong - there are a number of subtle differences between the platforms that requires a fair amount of additional testing. Distribution to distribution, you end up with a lot of version mismatches between the distros. One version might have the pam modules at 1.7.2, another might have 1.7.4 (version numbers are arbitrary, not necessarily correct) and thats one of the difficulties in testing your products on multiple distributions. Mix that with the differing base installs and the amount of customization you're allowed to do during installation and you've got a testing hell hole that requires near full testing on each distribution of linux you want to support.