[golergka]

It's especially true for indies: if you don't sell as much Windows copies, you won't sell as much Linux copies too, proportionally. I've worked in an indie publisher, and not a single one of our projects would return the investment of releasing a Linux version.

[richrichardsson]

> return the investment of releasing a Linux version

It must be nigh on impossible; beyond developer time, support requests will be a complete nightmare.

[krzyk]

So why do many indies do have Linux versions (Steam is a good source for those)?

From what you wrote it should be next to impossible to find them.