iMac Pro uses full on pro-grade components. Compare the price to the other professional workstations. If you're bitching about the price, the iMac Pro was not meant for you.
This doesn't give me the warm and fuzzies for the starting price of the (2018? 2019?) modular Mac Pro. That'll probably start around $6,500-$7,000. ffffffffuuuuuuudge....