How are you able to play on two teams in the same league? That's not allowed in either league I play in.
Also, some folks itt can't read or choose not to read. It's a flat $770 for the league plus balls. As the OP has stated, no frills, no extras, no sponsorship difference, no nothing. It's 770 plus balls for every team. One team charges $65. The other team charges $100. Unless there is only 8 players on that team, the team manager needs to answer for why the cost is an additional $35 per person.