If I was to guess about Notts I'd say
Youth players - £300-700 PW
(eg Brooks, Tyreace Palmer)
Fringe players - £800-1.2k per week
(eg Kelly-Evans, Knight)
Core players - £1.3-2k pw
(eg Brindley, Slocombe, Sam, O'Brien)
Star players - £2-4k pw
(eg Cameron, Palmer, Wootton, Roberts)
Might be totally wrong. But that's what I'd guess.