Most of the Ritzy staff do it as a fairly short term job; many are relatively new arrivals in London getting themselves established, or do it part time to support themselves while studying or doing other stuff at the same time.
They have the option to go and work somewhere else, doing something more boring and less flexible, if they want to.
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The Mcjob line of argument

. As Barbara Ehrenreich points out in "Nickel and Dimed" thats an argument business uses to pay there employees little-"Its not a "real" job.The idea that because you are "flexible" you should get paid less is now common and doesnt hold up either.If anything it should mean the opposite.
I get this all the time.Lots of jobs are now not "real" jobs,its your fault for doing them

and if you dont do them then your a lazy British worker unlike those hard working East Europeans(thats a new one I hear often.).
Also is Barbara Ehrenreich points out the division between skilled and unskilled is just used to pay low wages.The McJobs she did required knowledge and skills that are not valued or recognised.
Also as Ehrenreich found out the argument that people do these jobs temporarily is not accurate.Many Mcjob holders do them for a long time and there companies depend on a core of regular experienced staff who provide a continuity of experience.
From personal experience I agree with a lot of what BE says.