Correct me if I'm wrong, but I'm pretty sure the 6th member of your group is not in fact free, as some seem to think. The group EXP bonus is as follows:
2 - 2%
3 - 4%
4 - 6%
5 - 8%
6 - 10%
Consider going from having 5 people to having 6. When you have 5 people you get 1/5 of the EXP from each mob, and then get an extra 8% of that 1/5; this ends up being .2 * 1.08 = .216, i.e. 21.6% of the EXP from the mob. When you have 6 people you get 1/6 of the EXP from each mob and an extra 10% of that, so this gives you .1667 * 1.1 = .1833, i.e. 18.33% of the EXP of the mob. There's a clear decrease here; you end up getting 15% less exp per mob (this is (.1833-.216)/.216).
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