Remember that Cliff doesn't just work alone but with a whole lot of assistants, and that stage acts and all their techie guys only make money when actually performing, not while waiting for their agent to organise a gig.
There is an article at www.theguardian.com/music/2017/jan/30/where-does-concert-ticket-money-go about how the cost of putting on a concert and how the ticket money is split. It is all in dollars but the percentages are probably much the same.
The promoters have " . . things that they had to account for. These included (deep breath): venue hire, stage hands, venue staff, electricians, power, spotlight hire, scaffolding, barriers, catering, public liability insurance (in case anyone is injured at the show), backstage furniture (yes, really), forklifts, rigging, medical staff, transport and even towels."
And "The artist’s share then has to cover its own mini economy. The act will have their own crew (roadies, sound engineers, lighting crew, catering, tour manager, backing singers, extra musicians, dancers and so on) as well as transport trucks, with 30 articulated trucks on the road not being uncommon for the biggest shows. One huge act’s manager reportedly said it cost them $750,000 a day to be on the road, whether they were playing a show or not. Talking of which, don’t forget that the manager also needs their cut of the band’s share – normally 15%-20%.
Before any of that happens, rehearsal time has to be paid for as well as the design and build of stage sets. . . they can’t just show up and play to 80,000 people with a few lights and screens, hoping for the best."