It would pay homage to an important part of MMA history, and with their return to Japan and having ownership of all PRIDE properties, it would be a nice tradition to see a ring-based event that happens every so often.
because they are still trying to promote the UFC to the point of becoming a mainstream sport. Their focus relies on building the UFC as it should. As much as i would LOVE to see a PRIDE event it just wouldnt make sense at this time.
because it will damage their brand and what hattori hanzo said
All the fighters would think theyre playing by Pride rules and would start stomping the shit out of each other