Melhelix: Well, firstly because it is very hard to make a wrapper stable across the Mac OS board. A game that works in a wineskin wrapper in 10.4 might have issues on 10.7 or maybe the sound doesn't play on 10.8, that kind of thing. Many of the games they release for Mac have been placed in a wrapper; think of it like a tiny emulator that says, "okay game, pretend you are running on a pc, now go!" Some games have no problem with this, and are like, "yes, boss!" others like to have issues. The sound stutters, the videos won't play, the game won't save, the cursor lags, the cursor doesn't show, the screen tears across the top third, the game just won't launch, the game plays absolutely fine but can't handle changing locations, etc, etc.
There was a large release of Mac games fairly recently, Nov 15 had a batch of 34 games that are now able to run on Macs. It is one of those things that GOG is constantly working on in the background, just like the team that is focused on getting the rights to bring classic games to GOG. Many new games are nice because they are coming out multi-platform at launch (running on both Windows and Mac).
If you find the progress too slow, you can certainly try to make them work yourself, it actually is fairly easy to pick up when you only need the game to work on one specific computer. Download the Windows .exe installer of the game, and download a pre-made Wineskin wrapper to get you started.
and the [url=http://portingteam.com/files/]Porting Team are both good sources of solid wrappers. Then follow the instructions provided with the wrapper (generally double-click the wrapper, select install file, choose the .exe, let the installation run, click Exit instead of launch, set it to open the game.exe, and then run the wrapper and you should be good.) Wineskin Winery is a good thing to download if you wish to make your own. CrossOver is another good one to have in that it can occasionally run things without needing to tinker around in the WineConf (CrossOver has a 14 day free demo, Wineskin is just free permanently).
Older games often run in DosBox, Boxer is a Mac program which basically just runs them. Very easy to use.
Here are some GOGmixes with advice on what can run on a Mac in Wine or Boxer:
http://www.gog.com/mix/mac_friendly_gog_games_4 http://www.gog.com/mix/gog_games_on_a_mac_and_how thanks for reply....
I see what you're saying...and converting it myself is a hassle...(i'm lazy)....but really I guess I didn't realize they are constantly working behind the scene.
