Must be finding salaries for players (it's specifically designed to combat player drain due to PNG NRL), but the wage bill for each of these teams would only be a few million each (less for Fiji if it's run by the Drua) so there will be lots more. I'm guessing also flights and accom for Australian teams heading to the islands as well as those coming from them, and probably a decent chunk of development funding into the islands as well. It might even include money to get a women's side of the comp going as well.
Either that or significant facility investment, because $16.6m per team, per year is enough money to run a proper super rugby side, at least once you add in other funding opportunities like ticketing and sponsorship.