Next year's blessings? M-m-m-m, let's think.
Fundamentally, it comes down to departure airport. Birmingham, Stansted and Gatwick are all 1-1/2 to 2 hours away; add the three hours you need to be there before and you're setting off 5 hours before a 4 hour flight. Add to that the cost of fuel/parking, or taxi (not a major difference) and you've added in another £200-250 to the bill.
The much maligned (and much deserved) Luton is about 45 minutes, taxi is £20-odd, and when we arrive back at time starting with a 0, you can be home in bed before you have to get up.
(I haven't gone into how dire the assistance is at Gatwick, not that it's brill at Luton, either, but that's another story)
Now that Monarch is no longer with us, Monarch's slots became available. TC were selling flights in those slots when they didn't have them this year, and had to cancel most of those flights. easyJet took the principle Dalaman slot from Luton, hence they become favoured airline for the present, purely on lack of choice.
tui don't go from Luton at all and as they are prohibitively expensive, wouldn't even pop up on the comapre prices radar anyway.
Jet2 are Stansted and Birmingham only - see previous comments.
BA are Gatwick only as well, but since they tend to run out of drink by Paris on the outbound flight, well, you get the picture.
Pegasus are Gatwick only as well, see previous comments.
Which leaves Heathrow, which is about an hour on a good day (if there is such a thing on the M25), but means doing the stop and dash for the Dalaman flight in Istanbul - this is a shade more hassle than I (or my partner in crime) would contemplate.
So there you have it - it's looking like easyJet for the present.
Unless the Lottery comes up, and then it'll be a private charter Gulfstream (other executive jets are available) that will fly when you want (roughly - ATC permitting), you avoid security, they don't run out of food and drink, there's no babies screaming nor 6 year-olds kicking the seat, and you get more than 31 inches to the prisoner in front.
Remember when cabin crew/flight attendants were called hostesses or stewards? Doesn't the job title tell you everything about airline attitudes to the paying customer (or SLC as they're known in the industry (=Self-Loading Cargo)).
Yes I know I'm cynical, but we have to just do what we're told and accept it, don't we?