Volume discount is available for a SINGLE user wanting to install on many machines, for example cockpit builders that have multiple networked systems to display scenery.
So, with Volume discount, you have 1 serial, the only difference compared to the standard purchase, this serial has more activations available, so it can be installed on a network.
Since the serial it's just one, ALL your friends would be forced to share their activations so, it wouldn't be fair for them, because one of them might change hardware a lot, and "taking away" other's activations. And, since they haven't ordered (you have), they wouldn't even able to Reinstall themselves like a regular order, because there's no order for them, no registered email, etc.
Also, since the price for volume discount is very attractive, it's obvious that it couldn't be resold or gifted to other people, otherwise you would be able to simply buy in volume, then resell to anyone for a price lower than what we are offering and still making money out of it, with the support burden on us anyway...
So, Volume discount can't be used to resell/gift to other people, it's ONLY a convenience for users with many machines. Using it in another way, it's considered to be against the product license.