Entrances, entrances and entrances.
The only way to spend money that isn't entrances, is to buy new moves, that are better that the one that u have, and train them to lvl 5 only if u wanna make it a Trade/Signature.
Entrances = More exp, more fans, more advanced techniques, more money at invis.
And all the TPs to Tournaments where u are high at the lvl (top 100 or better top 50), to win money for entrances.