Initial expense is the issue. Added machine work is the other cost that you already know is a bad taste. Any time money leaves my wallet there is a bad taste.
Off hand, I don’t know what a Ritter block costs and the additional expense’s are also an unknown AND a variable expense. Not all machine shops charge get the same.
More or less the same issue with the MP race blocks. Initial expense is a lot. If you’re a serious person and or racer, the price is acceptable when a honest big power mill is being looked at. Not many diving into their wallets for this. Few build anything approaching the actual need for a race block.