Bruyere explained it best in another thread as being like a PBS membership type thing.
You can play for free, which is a great thing, or you can donate to the cost of running the site and get some perks for your donation. ($20 for 6 months). I have played both ways. I enjoy the perks, and I see it as a great entertainment investment. As much time as I spend here, it is very reasonable. I could spend $20 on one evening of a cheap dinner and one movie, or for $20 I get six months of entertainment. The real bonus of the perks comes into effect if you spend alot of time in Quizzyland. Since I bounce back and forth between the Forums and Quizzyland, I see the Gold membership as a real time saver for me, being able to know which quizzes I have already played (for example of one perk), now that I am nearing the 5000 mark.
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[color:"purple"]"Buy a jumbo jet
And then bury all your clothes
Paint your left knee green
Then extract your wisdom teeth." [/color]