Its sucks but thats how it is, I know several studio owners they are about evenly split between MAC and PC and alot of them have been migrating towards pc for sometime as the performance of MAC isn't always the best with big effects loads.
but don't worry, someone will stumble in here any minute and tell you how many movies studios etc are using linux to do stuff, while this is somewhat true they are using linux running custom software to run render farms. Very few big studios run linux and if they are its not software the average studio users or home musician can use.
Point in case. Cubase and Nuendo and Protools are pretty much the bggest names in DAWs. they offer no versions for linux AFAIK and i doubt that will change. Likely due to the open nature of linux and IP concerns.