Take a look at Skyscanner at fares going this weekend, ie just 3 or 4 days time. You have a vast array of destinations at your disposal for under £100 return, most are under £70 and some such as Ibiza are as low as £35. This isn’t exclusive to Primera or indeed to STN, it’s across the board.
They will be burning cash taking less than 20 to Malaga midweek, that has to be a worry. Perhaps they would be wiser sticking to the long haul routes.