The end user (depending on applicable copyright laws) often can't legally use Cider to wrap up Windows games. GOG could and that would greatly simplify "porting" the games to Mac. However, the licensing fees are quite high and the price of the games would surely double.

The end user does have some spiffy options for bundling games into Mac-like "single-file" app packages.

WineBottler, as the name suggests, wraps your windows software into stand-alone app packages. It's not for beginners, but it is pretty satisfying if you can successfully configure WINE. http://winebottler.kronenberg.org/

Boxer is the DOSBox frontend to end all DOSBox frontends. Try it for yourself, if you haven't done so already. http://boxerapp.com/

For ScummVM games, I take the Mac port of ScummVM and wrap it with individual games using Platypus. http://www.sveinbjorn.org/platypus

Yes, with a little work, any game can feel right at home on my Mac.

My game shelf