I guess the price is not really THAT bad considering that the speakers' MSRP is $15k/pair. $2200 for a pair of diamond tweeters is just under 15% of MSRP. I recently replaced some Klipsch tweeters. I think the cost of the tweeters was roughly the same % of MSRP of the speakers.
Expensive things have expensive parts. Such is life.
"When I eat, it is the food that is scared." - Ron Swanson