For ROB:
LBA is pretty much run by certain airlines, Jet2 and BMI have the monopoly here so charter companies can charge what they want for a week in egypt, as mentioned by someone else, MAN will have First Choice, Thomsonfly, My Travel and Thomas Cook all operating similar flights to similar destinations, and the competition obviously means more competitive prices...
LBA can have a charter flight to TABA or whereever and charge what they want until someone like Jet2 comes along offering the flights for 30 odd quid, until then you will have to be patient and think about going somewhere else if you dont want to fly from MAN...
As for Jet2 Lisbon, read an article in a paper today (nothing to do with LIS) but was on about low cost expansion in MADRID BARAJAS and in fact the whole of spain, so maybe Madrid could be an up and coming route?
new destinations set to be announced iv heard are Cyprus!