There is a problem at FMM, it is day Ops only and Skippers landing. This is due to runway width of 30 meters (a throw back to its Military past). So I guess a base there would be difficult, especially in winter!
I hear KRH is doing major runway work and BVA is closed at the moment for runway work and Cat3 ILS installation. Maybe these where Ryanair demands in advance of becoming a base. I guess important with BVA, don't want based aircraft and crews diverting overnight! chaos