Plus don't forget that 1.21% of linux means what.
That you've got a POSIX environment to target? What percentage are running X!
However, I think that the fact people write things in cross platform frameworks like Qt or Java or Moonlight actually hurts you argument that with 1.21% market share no one will target it. The fact is no one targets it for a worse reason, their users, probably won't buy it. A lot of people in the open source community rally against anything which is commercial.