[asark]

1) There actually are quite a few games available that run natively on Linux these days. Usually not AAA titles but lots of indie games. I've got (checks) about 550 games on Steam, largely through various bundle sales, and something like 30% of them run natively on Linux.

2) Steam now bundles Wine and lots of games are tested and semi-officially supported with it now, bumps the playable fraction to more like 60-70%—and you can enable it for all games with a settings checkbox, too, and more often than not it works.