To save money and cut out fraud!
It also creates major resentment as many less well off people can't claim but high income self employed do!
This allowance is meant to be received by those on a low income
However many self employed and very well off people get this. The system is being abused by many and the offspring of the well heeled are claiming what they don't deserve and are not entitled to.
Those who work within the ystem have much anecdotal knowledge of abuse of this allowance.
Accountants of the self employed collude in allowing this to happen