Well, actually, Harry is quite wealthy, but his "muggle" Aunt and Uncle don't know that. Harry learns of the wealth when he goes off to Hogwarts. Part of the story line involves the fact that Harry always has money while his best friend Ron, comes from a large, working class family and wears a lot of hand me downs...
Yikes! Right you are. Will you at least concede that mentally, he thinks of himself as poor in material things?
Agreed.