+1 for linux, I have not been using anything else besides this for years, so have lots of people around me - also I know designers, print studios and even professional print studios who really would switch to linux immediately, if adobe software would run with it.
you have one possible advantage here that could change the entire market.
also for me a native (non-wine) release of any serif's software is an instabuy, especially AD, including myself + colleagues I work with.
saying that: reconsider your decision, it is not super-hard, and will surely not cost 500k. you basically need to support GTK or preferably QT as the GUI (like .net on windows for example) and hardly more than 2 packaging systems which are rpm and deb, both are practically the same behind the scenes.
any small dev team could port all that, there are lots of GTK/QT-devs out there, just find one or two, employ or just pay them for the job, and let them do it.