I agree with dung on his comment that with a deeper wallet, comes the potential to qualify in a much better position. however, that doesn't mean that you're going to do well in the finals (especially if you're a "hit or miss" player)
MPE used the pump and dump format this year and to be honest, I think it was a much better value for the players. pay one flat fee to enter the tournament, and then you, yourself set the limit on what you want to dump into the games. the only thing that happens with a pump and dump format is the potential that a single machine has a huge line. with the current ticket format, all games are played an equal number of times, which leads me to...
the tourney @ expo used the ticket format this year, but a comment was made that I think also holds merit. if need to qualify 6 games and you have 12 tickets, it would be nice if the player could decide where they wanted to use those additional 6 tickets (all on one game or spread them around). the software would just need to be changed to ensure that each play is captured (regardless of score) so that after 12 games total are played, the player is locked out. similar in nature to pump and dump, but with a set number of total plays.
ticket format = a potentially larger pool of players because everyone has the same number of chances to have a [good] game and you can funnel more players through the lines given that each player has a set number of tries [per machine]