Sorry its true !
STN lived on the fruits of LHR and LGW for years, NG is correct, prices have gone up to realistic levels and the only reason that kept the LoCo's using an airport in the middle of nowehere was price !
Now that attraction has gone "see Air Berlin , Air Asia etc" there is no reason to stay !
It's not the end of the line, far from it, but the original reason for building STN as another London airport for overspill from LHR and LGW has never been fulfilled.
It's market was artificially generated when the LoCos exploded on the scene,
had they not appeared it would have struggled to become little more than a regional airport !