Not sure I agree with you there. Monarch have picked up the Canadian Affair Toronto 757 contract which must be a set back to TCX.
Yes, the ZB department have jacked up their fares over the last few weeks, but you do get what you pay for.
I recently was caught up in a ZB weather diversion. they were excellant. Got the aircraft refuelled & then onwards to our destination. Meanwhile the RYR & EZY diverted pax were kicking around the terminal waiting for coaches.
Also when strikes / weather & various other factors kick off, ZB will usually get you there, late maybe, but you get there. With the other well known lo co's you get your money back or a three week wait for a seat. You have to factor in if you think that is worth an extra few quid each, to me, it is.