IMO it would be better to have some introductory offer for all interested buyers only this year. It's the end of the year, people always bought a lot of stuff (Black Friday, some big updates like Cubase 7 are near the public release, Xmas presents).
Some persistent discount for customers is IMO another story. Have 1 Tone2 plug-in get 5%, have 2 get 10%... You get the picture.

