Or maybe not. The sort of people showing off their mad typing skills probably wouldn't also be people who want to buy your service :)
First I bought a downloadable version, which then sent me on a wild goose chase for Stuffit Expander, which was required to uncompress the image. Then when I finally got that, it wouldn't run on my OSX Mac.
Finally I learned that there was in fact an up-to-date version available for Mac, but only on CDROM. So then I purchased THAT (yeah, I paid twice!) Ultimately, the software was great, but getting it installed was a major PITA.
I imagine that there are a lot of traditional desktop apps like this that you can only get on CD (or dodgy software downloads). That's the "niche" I'd like to target.