As it seems that there is just one copyright holder, the obvious answer is that it makes buying commercial licenses more likely option. For a small company or

As it seems that there is just one copyright holder, the obvious answer is that it makes buying commercial licenses more likely option. For a small company or single person who sells code for a living, GPL is a great license as a first option. People can play with the code and use it for software that is GPL compatible. For everything else you must come up with a coin.