Just because we can doesn't mean we should
Many pilots quite a few of them commercial are just fed up of being over controlled out the way of inbounds. Especially when they can see the IFR inbound.
The only problems they have caused is the in ability of being able to give the separation that has been dictated locally as required on a de-confliction service.
And the commercial guys are fully aware of the "problems" it creates and their hearts bleed that easyjet has to do more track miles and therefore makes less profit.
Easier and cheaper to not speak to them.
The cost of obtaining the CAS will be passed onto the customer and the airport will not be as attractive as it was as the prices will go up.
BTW the major airprox which was more luck than judgment there wasn't smoking holes in the ground at southend was a commercial helicopter transiting 10-15 miles away not speaking to them while the radar was down. My reading of it was the CAT aircraft put themselves in danger by exposing themselves sub 5000ft for a long period doing the complete unprotected procedure. But they don't seem to want to look how the CAT aircraft are being operated in class G which does require a different way of thinking to in protected airspace.
They have cleaned up their act a lot since the solo student was killed as far as I can tell. But people have long memory's and a lot don't want anything to do with them.
But its cost the owners of Southend millions just to force pilots into speaking to them.