I think WrestleKingdom is the only PPV with English commentary. Their show on AXS TV (formerly HDNet) has English commentary as well. Adding it to everything else would definitely improve their subscribers, but they'll need to crunch numbers to determine the cost effectiveness of that before doing so.
Tbh people have gotten by watching Puro for years without understanding what the commentators are saying, so it shouldn't hurt the numbers of existing fans signing up. It would be more to entice new viewers than anything else.