I would have to think that even with including bonuses etc, there are very few in the 4MM category eligible for the plat status.
At that point to get >4MM you'll likely be getting close to retirement or not flying as much, so the status becomes something to be used for leisure travel. More than likely that those pax with >4MM have been DM for years or 360 as well.
However, it may bea bit of a disappointment if somebody is up in the 6MM+ range and they retire that they get dropped to PM from their DM/360 and probably 30+ years flying on DL.