Tower of Infinity largely has become pointless in the last year or so because you no longer need to do it for Soul Badge, you simply get the second best one in the game from Soul Boost. In order to make it better, it needs the following:
1) Better rewards. The rewards from it have no current value in any content, both from what you can purchase and weekly/seasonal rewards. The rank 30 or better outfit is nice, but that's the only reason I even do Tower of Infinity anymore.
2) A greater challenge. Right now, most of my characters can clear even floor 100 in under 5 seconds. The enemies just cannot compare to people wearing Starcross Tier equipment or better.
Also welcome to the forums, Tulikko. We don't see new faces from NCSoft often.