We hired a C list celeb for comparing at our annual work conference, £4k for 1/2 day, £6k for the day and that was 15 years ago.
The rate you’ve quoted doesn’t surprise me at all. Compare it to say a more high profile presenter like Tess Daly, whereby according to the BBC, was paid a total of £350,000-£399,999 in the 2016-2017 period by the BBC (quick Google that was too search). She roughly works 13 Saturdays for Strictly, plus say a day extra a week within the series, plus other BBC stuff, eg Children in Need, Comic Relief, specials etc, so let’s round up to 30 days year for the lower end of that bracket - that’s £11.6k a day minimum!
As pp said, they’ll pay tax (40%~45% depending on earnings), agent fees, PA, hair, makeup, private travel, accommodation etc all adds up and could be dropped instantly if a global pandemic comes along or they say or do something wrong like drink drive and crash cars and lose driving licenses unless your name is Ant Macpillock or Katie Prick