Steveroo.... I understand your frustration, I really do. You start a multiplayer game and it ends up being solo, not what you signed up for, and it irritates you. It's been one of the biggest topics on this board since the time that we only had stroke play on the front half of Kiawah, and it's a fact of life that people on a computer will just leave.
In regards to your idea of a +1 for bailing... I'm sorry, but it just won't work. Once you have reached the Master level, your score/average means nothing at all in the scheme of WGT.
We have to deal with it... each in their own way. Personally I don't like to be left alone either, but I understand why some do it. I don't. I have left one MPlayer game in my time here and that was because one person in the foursome was being a piece of dung... and everyone left. That being said, I will tell you that my argument from the beginning is that quitting, in the grand scheme of things, doesn't matter. Is it irritating? Yes. Is it an inconvenience? Yes.
Is there a way around it? Yes.
Look at the WGTLS ladders at www.wgtls.co.uk. There are hundreds of people there, waiting and willing to play full games for fun and competition and a generally good time. Mark has done a fabulous job of setting everything up from general 9 and 18 hole games, to guilds, tourneys, challenges etc etc etc. They have their own forums, chat rooms, and even an arcade full of various and sundry games to play to wile away the time. Guaranteed to build your friends list, supply you with endless hours of WGT enjoyment and perhaps a laugh or two.
Bottom line is this.... Random MPlayer games will include people who will quit. We can't change that, even with "Reputation Tracking". To avoid them, play with others who share a common goal.... The goal to have fun with this silly little thing we call WGT.
Peace.