The Strand serves as a social and economic hub for the Bootle community. Mothers and daughters meet there to shop and a coffee. You see plenty of mothers pushing prams, which would indicate that they've probably walked there.
If they had have gone to Asda or a retail park, they would have probably drove or got a taxi, thus stopping them from getting exercise. It gives them a reason to walk.
The shops and banks probably employ many from the surrounding area, which provides financial stability to many families. It gives individuals the opportunity to start a business, like the gents hairdresser by where Costa's chippie used to be.
The downside is that you have to pay a couple of quid to park your car in their car park for easy access. Really? The chance are that you would pay that for a basic coffee in Costa or for a pint in Wetherspoons.