Even if the software is commercial as long as it is open source, you have motivations to tinker with it, to adapt it to your own problems and preferences and people will still look at it to learn.
Why is the fact that would the fact that you paid for this source-code make you not want to change that color there, that shortcut here etc...
Personally I wouldn't. If I tinker with open source software, at least I can publish my results, so it is that much more efficient than tinkering with closed source software.
Why is the fact that would the fact that you paid for this source-code make you not want to change that color there, that shortcut here etc...