Like I said, Gatwick, used to be 4 flights a day, not some days it is only 1 a day, and on others the times are woefully inadequate.
Remember slots, these are expensive and hard to come by at Gatwick.
Flybe sold theirs on. EZY likes to run 85%+ full so adding a 2 or 3 rotation a day, would it achieve that load factor? The Gatwick aircraft, I believe come from Scottish bases, go down to LGW then do IOM then some Med routes, before back to IOM.
More likely to get more capacity to Luton, although I have not looked at last summer's pax figures.
I think BA sum it up well, use it or loose it!