Few commercial projects will open source their code, unless they already have reasons to believe that they can't be usurped for one reason or another.
The flip side of this is that for business/enterprise
software, there is very little risk in just making
your code open source and then selling a
commercialversion.
Design. ($25 of stock icons doubled my sales back
in the day. Most OSS projects do not have anyone
who would care enough to secure the equivalent.)