How about putting the emphasis on the next gemquest on variety of quests.
Along the same lines as before, but with the value of quests decresing on an individual basis as well as overall.
ie each time a particual quest is done by each person, they get less for it, so could only do it 10 times if 10 points was maximum.
This would mean that the winner was the one who completed the biggest variety of quests, not the most quests.
Then there would be an even greater emphasis on finding rare quests.
Sparkster, in for his tuppenyworth.
PS Culinane: well done dude! Your were unstoppable.
Written by my hand on the 26th of Hindyear, in the year 979.