Most mopar racers, don´t have the budget or the chassi in door slammer cars to take advantage of 1200+ hp, here´s the biggest reason why predator heads are hard to sell.
I think that the mind opens up to none wedge designs, once you have struggled to run under 8 seconds with a door car.
One exception for the PSO head tho.

Look at the fastest times, list, just 12 members in the 7 to 8 sec. list and half of those are dragsters. The potencial customers for N/A 1200+hp are not many, on this mopar board.
Just my opinion, and I would´t mind to run Predator heads myself, or PSO heads either for that matter.