Yea, I'm pretty sure a lot of oldskool adventure and RPG gamers have switched to Linux "lately" (including me) - since there was no reason to stay with Windows.
I'm willing to claim that I fit into the adventure-gamers' generation (being born in 1983) and from what I can see, quite a number of this generation started looking at Linux as a great alternative to Windows. I, for instance, use Linux since 1996 and the only reason that brought be back to Windows (as dual-boot!) could be a good game that didn't have a Linux port. That happened only twice in that period - once it was because of NWN, when it wasn't ported yet.
But since in my eyes - and I guess we're all here on the TellTale forums for the same reason - there hasn't been a good enough Windows-only game in the past decade, I don't plan on having (and buying!) an expensive OS clogging my disk to just sit there waiting for the good times to return. I'm more then willing to pay a fair price for a good game - that has nothing to do with the fact that (almost) all software I use, including games and the OS itself are free. But I'm not willing to buy a whole OS (and another disk!) to just play a game - that's one (or two) expenses too much!
I'm pretty sure I'm not the only one who thinks this way.
On a side note: if you'd stick with open-standards, you could save some money on the creation of the games - let's say you use ogg/vorbis instead of mp3, because you don't need to pay for the usage (like you do with mp3!). Also you might take some open-source tools (or even engines) to lighten your bills.
I know this post isn't the most coherent in forum-history, but I've got waaaaay too much things on my mind to clean it up. ...sorry
P.S. Words can't describe the happiness I felt when I first read about TT's start and plans! I hope you can repeat that feeling with making games that I can actually play!