cuppsy: Their first few bundles (or the first few I saw) were almost entirely Linux-compatible... and since then, it's just dropped off (save for, I think, one of five games being Linux-friendly last go-round). Sad... Humble has made more money from Linux users than Mac users on basically every bundle. Ah well, pass again.
bevinator: Aren't Linux gamers a bigger segment of the population than Mac gamers in the first place, though? Or is that only if you don't count the iOS folks?
Not sure the overall numbers, but Linux users generally pay more per bundle and provide more overall revenue than Mac users. And despite that, most of the IR bundles include Mac versions but not Linux ones.
Also, it probably should be mentioned, in fairness, that it falls as much on developers of those games wanting to put out Linux versions as it does on IR. Either way, makes me sad as things like HIB and GOG have given me more options to game in Linux, and I wanna see IR keep that up.