I think the 50k to 75k jump is undervalued; the difference in PRs is huge. With worldwide Y and PY available at 50% off, it’s way cheaper for 75ks to fly overseas on points. Moreover they are more likely to be in J, because they will be upgrading from the PY cabin or because latitude redemptions are pretty cheap when they’re half-price and they’ll book flights with R space.

That said, people who don’t hit 75k organically are unlikely to get many PRs. Still, it could make a real difference if enough people are 75ks who wouldn’t otherwise be but for the error.