There is a pricetag that comes with the software, which is definitely not in line with the typical javascript ideology, in my opinon.
FTFY.
Seriously, I don't get it.
As others said, I'm more interested in donating (and helping to persuade others to) to make it available for everyone than I am in buying a copy.
http://www.indiegogo.com/projects/tern-intelligent-javascrip... is an example of successfully raising money for a javascript tool, although in that case the money was raised before the work was finished.
Plus, if you have more people contributing changes/additions, you might have less of a workload.
One last question for you: if I pay, do I get the source that I can tinker with/extend, or is it in a minified/obfuscated format?
I bought it just a few hours ago, works excellent.
Good grief.