I am pretty sure anyone who pays now would rather not pay. People generally like to keep their money.
You might only have a handful of alliances or players who would want to compete with paying.
People buy cards now because they feel they have to because the other side is, and the other side buys cards because they also feel they have to. It is a bit silly really.
Making money when people can spend to save time is the way to go. I think it is just important for Nexon to find the right balance for what that is. Obviously people have different values they put on their time. But, if you make everything available for non paying players that is available for paying players, but one takes time and one takes money, and you find the right time duration and right price.
I do think there are a large number of players who used to pay and now don't because they feel frustrated with some aspects of the game. Sometimes fixing things that seem to not give an immediate paycheck might seem worthless, but in the long run, keeping your customers is the most important.
Nexon has a lot of things to work on and fix. I think in their last few updates, there have been some good things.
BUT, I think the biggest problem is that Nexon developers don't play this game like we do, so they don't know this game like we do, and they don't consult us before implementing something new (or at the very least know which advice from players to listen to).