The #1 PvP player on T has 1.29 million points. To maintain this position, he needs to win enough battles each week to make up for the 10% decay of 129,000 points. A win against a top tier player earns 484 points. So, this player has to win 267 battles each week (plus whatever it takes to offset losing when attacked by other players). 267 auto battles is a piece of cake. However, there is a max of 84 free weekly battles so he'd have to pay medals or diamonds to obtain the other 183 battles. In FE, buying the first battle costs 120 medals and it goes up by 10% with each subsequent purchase. I'll leave it up to a spreadsheet geek to figure out how many medals are needed to buy 183 battles per week.