>Ultimately, I don't think people will have a problem with paying, and certainly not such a small amount.
Growl use seems to be integrated in several open source projects. I probably would never have gone out of my way to get it -- but, a couple of apps I did want suggested installing growl, and it works quite nicely. (I think Adium is what finally prompted me to install it.)
If for no other reason a fork will appear if growl is not freely available, because a lot of open source projects use it under the assumption that it is available.
Growl use seems to be integrated in several open source projects. I probably would never have gone out of my way to get it -- but, a couple of apps I did want suggested installing growl, and it works quite nicely. (I think Adium is what finally prompted me to install it.)
If for no other reason a fork will appear if growl is not freely available, because a lot of open source projects use it under the assumption that it is available.