Rather than having a single field determine the category of the comment, it seems like you might want to consider using multiple measure fields.
PriceCountA = Price criteria set 1 ... THEN 1 ELSE 0 END
PriceCountB = Price criteria set 2 ... THEN 1 ELSE 0 END
OtherCategory = Price criteria set x ... THEN 1 ELSE 0 END
Then, you can sum each of the different measures and have a count for each criteria.
You could combine the PriceCountA + PriceCountB as TotalPriceCount or IF PriceCountA = 1 OR PriceCountB = 1 THEN 1 ELSE 0 END...
I should have though of doing it this way!
Thanks a lot Mark!