Nixnote2 have 500 downloads per day or 182.000 downloads per year so there is a market for Evernote for Linux which will be much larger if there where a native Linux client.
Nixnote2 have some bugs that makes it irritating to work with. I am a paying Evernote customer and consider to cancel because of a lack of a linux client or support for Nixnote2 or running Evernote on Wine which does not work well either.