So, really: what's the point?

Mac/Safari browser market share has to be sub-10%, since Mac itself is 10% (or less) of the OS market share. So, if you purchase the theme, 90+% of your purchase is going to be for the degraded theme. (Hope it's a good one!)

How is this any different than the late-90s craze of designing web sites using Microsoft IE-specific features (which led to the interwebs being plastered with "This Site Best Viewed in IE" images)?