If you want to sell this sort of stuff, you should aim it at .Net programmers. As generalising as this may sound, they are used to paying money for software, so are more likely to buy yours. Not so in the open source world. Naturally, you'll want to buy yourself a copy of Visual Studio, probably buy a copy of ReSharper as well, to get yourself started.

Whatever you pay for the licence, you don't get to modify the code (unless I'm misunderstanding what "no-derivative" means). That's what "de-excited" me about it.

For all non open-source projects it makes sense to have a no-derivative works license. You would be putting yourself out of business without it.

Awesome script, I'll definitely be using it in some projects.

I agree that it makes sense to prohibit the distribution of modified copies, but it is usually better to let people modify the software as long as they keep those modifications internal.