It'll be a combo of things.
1) It costs more to make these HEDT boards
2) Their only competitor also has high prices for whatever reason and AMD is deliberately pricing the total cost of having an AMD system lower. Still high but lower.
AMD gave plenty of notice that the WX boards are not for casuals or enthusiasts. Their only purpose is serious workloads. Ironically its the opposite of what you said. There's going to be hardly anyone qualified to benefit from a 32 core threadripper but they'll know who they are.
General purpose stops at 16 cores but all the motherboards have to be capable of still taking the 32 core so you pay for the capacity you can't use.
1) It costs more to make these HEDT boards
2) Their only competitor also has high prices for whatever reason and AMD is deliberately pricing the total cost of having an AMD system lower. Still high but lower.
Nobody is dumb enough to get the 32 core threadripper apart from the reviewers who got it for free. The members market is full of overpriced mobos that never get sold because there is no point to them.
AMD gave plenty of notice that the WX boards are not for casuals or enthusiasts. Their only purpose is serious workloads. Ironically its the opposite of what you said. There's going to be hardly anyone qualified to benefit from a 32 core threadripper but they'll know who they are.
General purpose stops at 16 cores but all the motherboards have to be capable of still taking the 32 core so you pay for the capacity you can't use.