I believe that's what it SHOULD do, but it doesn't seem to affect it whatsoever (talking about level tower)
Yeah level tower seems to be broken but everything else beyond seems to be functioning at the least or the incremental is so low that it's negligible of a bonus. Aside from the level tower I was explaining the functions of the others to the previous comment and sadly the game is abandoned so I doubt level tower will be fixed.
Noted. I'm not sure either, as it's the next thing I unlock
Update: I've unlocked it. I'm not quite sure what it does still, but when it gets to a new highest rank, my money increases by quite a bit.
Update 2: Once level tower hits 9, you get a huge increase in monetary gains. So it probably is such a minute amount of bonus until it gets to higher levels