They screwed themselves by showing the extra games for free in the first lockdown, so were never going to get away with PPV after that, and definitely not for £14.95.
They most likely looked at championship, L1 & L2 charging £10 a game, and wrongly thought £15 was logical for a higher quality game.
Overlooking that those lower league teams season ticket holders are getting the home games free via deals with their clubs, and even some midweek aways.
The key extra thing to note is that most of those games can only be seen on the ifollow platform, you can't find streams online. You can tap into some clever VPN shenanighans, but firstly you're still paying that way, and secondly it's a bit dodgier than mere stream use, as you're linking your debit/credit card to your account.
Meanwhile, premier league fans have typically already paid for sky & bt, and may well have shelled out for a season ticket, so to try and smash them a 4th time was really optimistic, when they can just click a button and find the game elsewhere.