I'm just not sure that the house should be a museum, really. As I said, John and Paul's houses are the places where the early classics were written and demoed, but Ringo's house is just the place where his grandparents lived and Ringo's parents spent most of their unhappy marriage. Certainly he was born there, but nothing that could be described as Beatle Magic occurred under that roof.
And, if you want to put Ringo 'into context', then Liverpool still has plenty of grotty slums to show off! And, indeed, Lennon's earliest years at Newcastle Road and suchlike were hardly spent in grand palaces. Even when he did get to go and live at lovely Menlove Ave, I'm sure that it was George and Ringo who had the happier times at home. George with his beloved parents (his Mum used to go to his gigs!) and Ringo with his beloved Elsie and Harry.
You don't have to be materially rich to be spiritually rich