I forgot to address the leveling and training of characters in my previous post, as this is something that is being overlooked.
From the point that you acquire a four star gold wrestler at level 1, it costs 32,767,200 coins to take them all the way to level 180. In addition, to fully max their moves requires 2,374 training points for each of the three colors of their special moves for a total of 7,122. Now, it is certainly possible to have this amount of coins and TP in your account through normal play. However, DSP is getting multiple new characters on the regular and seems to be bringing them up to max ability almost immediately. I can't imagine that he is doing this without investing more money into resources, which is just another big money pit.