Not everybody can afford quality. Thats life.
Not all the ladies of Marple can afford to shop at Helen Winterson or Yvonne Gillon, but that doesn't mean these shops shouldn't be here. Many can shop there, and do.
Not everyone can afford a car. Should we close the petrol stations? Of course not.
We need to cater for all groups. Not just the well off, and not just those on limited incomes. So, in terms of supermarkets, we could easily support having an Asda/Tesco/Aldi and a Waitrose/M&S.
There are plenty of houses for sale in the area at over £500k, some over £1m and even a few over £1.5m. This is not an impoverished area.