.....or of course there could be a block booking for a tour operator (which may be the main reason for the route being started), with just a few seats left to sell to others. I think the SOU-VRN route originally started as a charter (presumably for similar reasons) before becoming a scheduled route.
The above is purely conjecture on my part.
On the wider subject of the "sun routes", adfly's info above suggests 28 rotations per week on the 195, which sounds like just about enough to keep 2 airframes going?