Some cannot be paid enough. Here and there, perhaps under the auspices of 'Solace' Peter mentions above, some retire from one executive post only to pop-up elsewhere as self-employed consultants. Thus raking in the high remuneration (about £165,000/annum) while getting paid the pension from they authority they 'retired' from.
Difficult to countenance such 'double-dipping' at any time, but while these self same individuals are rescuing the public purse through sacking front-line staff, it is more than a little sad these days.
Certain deals seem to be set in Aspic, more Soused than Pickled.
