If they were made on an affordable price, more would be sold, so there would be the profit.
Why Prothane and Energy Suspension are able to offer a similar product on a decent price for virtually same part to the same market needs?
I don't think polyurethane is cheaper than rubber, not at least with this huge difference.
Let's check the price again!
https://www.summitracing.com/parts/ptp-4-101-bl/make/dodge/model/charger/year/1974
True that kit doesn't include the T bars Crossmember mounts! But look at the price! Add maybe 50% more if they were included.
Sorry 69bfan ( and Montclaire ) but this is my opinion, which I think is not out mind. Actually reasoneable and also respectable. I appreciate the effort of making parts, but they should be into the market price rate too.
I dream with the stockish replacement ( really, I do ) Which is not 18 pieces, but actually 22 if we think on the washer attached to the top section of the K member mount, but not being 350-400% more expensive than the alternative part which doesn't look incorrect and adds more stiffening ( so told by experts, better handling ). I can stand 150-180% more expensive, mabe even 200%, but 350-400%?
Add to this that Poly will last longer than rubber! Maybe they could survive me.
Think also both options are pointing out to the same market window and needs.