I would highly doubt you will get any kind of discount. In fact, if you purchase all together, you may get a HIGHER price since that many tickets may not be available at the lowest fare. Price them out for a small number and also the whole number to see what prices you get.
Also, keep in mind that groups booked together (7 or more) are not usually able to check in online, at least with the airlines I have flown in the past few years. It would be best to break an itinerary into two parts to make sure you can use online check in.
Our baseball team went to Florida and was stuck paying $330+/ticket when everyone else was getting tickets for $220 or less......
Good luck.
duds