Yield aside, what will be interesting is how long it takes them to sell the next 100,000 seats.
Based on the app download statistics they have a shade less than 150,000 Android users and likely a similar number of iOs users. We'll be generous and say 300,000 potential bookers. Some of those bookers will have families, others will not. So Bonza's potential customer pool currently likely sits at around maybe 500,000.
Back of the napkin, averaged out across all routes, Bonz will need every customer in that pool to take at least one return trip a year with them to fill 90 percent of their seats at 120 sectors a week. Not impossible on the face of it, but there will be a capacity constraint at popular times, and as others have noted, their scheduling isn't very conducive to weekend getaways.
As the Zen Master said, "We'll see."