It's strictly up to JRR. The standard coupon is "groupbuyauto" which takes off 15% and is usually
applied automatically in cart. If that coupon shows in the cart, then the GROUP code will knock
off the extra 1%. If the "groupbuyauto" code doesn't show, ,then either coupons aren't allowed,
or the FORUM code will work, but it's a crap-shoot!