Marple has more empty retail premises than Glossop, Buxton and Whaley Bridge - all of which have large supermarket a fair distance away from the town centre. Make of this what you will.
As for the likes of paint, DIY, car related stuff in supermarkets, it's never more than a token effort on their part. You'd never go into a supermarket for anything requiring advice on any of these matters - which most DIY and car stuff entails.