The problem isn't TNA's number of PPV events. They are doing it right by having one each month. WWE could learn something from that. TNA should instead keep each PPV they have and promote them better. Traveling outside the Impact Zone for all of them would help too. People aren't going to fly out to the Impact Zone just for a PPV if they live out of state. Going to a "Big Four" format would not benefit TNA because at this point they need the money they get from each PPV buy. They are much better off improving their promoting instead of deleting any of their events or adding new ones. Monthly shows with much better promoting will help them tremendously.
what are you trying to say? WWE needs to learn from TNA?
WWE PPV's are once a month, unless it happens that a weekend falls on the start or end of the month and or they can't book an arena for a certain sunday. Regardless they sell enough buyrates, whether it was once a month or 2 a month and they had dedicated 2 a month cause it was 1 for each brand and that was years ago. Though they will likely go that route again.
Personally once a month is great to watch but the leadups and fueds are weak, so it's a tradeoff. and in the case of TNA, Impact usually ends up being more entertaining then the PPV's they are leading too.
TNA cutting back to less wouldn't improve buyrates.
There issues are beyond time needed to build fueds etc.