Yeah, it kinda sucks. While I can't fault the Japanese distributor for wanting to perpetutate a market that charges for multi-volume high value releases, the simple truth is that it means the global anime market essentially becomes an extension of the Japanese market, as opposed to falling in line with the UK norm - ie. good value complete season box sets.
I was surprised Anime Ltd managed to get away with doing a full cour set of DRRR x2 and Aldnoah Zero - but does this mean the future DRRR x2 sets will be split?
The trouble with Aniplex is that they're super savvy - the reason people are willing to pay so much is that 80-90% of their shows end up being massive hits, so there's always demand, no matter the price.