This means that the 2 biggest groups of people that become Councillors are a) young people who want to get into politics (many many MP's start as Councillors) b) old people who want to top up their state pension and c) people who can be Councillors full time because their spouse is the bread winner.
In short, any one who has any experience, qualifications or business acumen doesn't become a Cllr.
I'm sure you're already aware but 'allowance' is their pay. I have no issue with their pay, its very modest for the job - but with low pay comes a higher risk of corruption.
Maybe when I'm home I'll compare the number of Cllrs per capita for Coventry and other similar cities.