The problem with the whole system is that it encourages people to continue duping SoJs in order to summon DClone. Though it did clean up some SoJs, it only provides a stronger incentive to make more of them.

Yeah, as Dragon said, SoJ sales on NL also affect Ladder, since they both use the same server IP addresses in determining which server DClone spawns on, and in such a case where 100 SoJs are sold at the start of the counter, DClone will spawn on all games using that server.