From what I've read:
George was the most money minded in the early days, but as time progress and he became more focussed on cosmic and religious matters he became less interested. In later life he did put money into HandMade Films but I think that was more for fun than for investments.
I think Paul has te mist business sense - look at the music publishing side of MPL (owns Buddy Holly, musicals -inc Guys & Dolls). I don't think he is particularly money obsessed - but he does know good ways of investing/using what he has got (which is a lot!).
I understand that when John went into his house-husband period Yoko took over the business side of things. Don't really know but never got the idea he was too into that (imagine no possessions after all!!).
Ringo - no idea!
However I think what they all didn't like was being s*r*w*d over by people. Hence John, George and Ringo taking with Klein (who of course had a reputation of getting unpaid royalties for artists) and why they later dumped him when Paul's opinions of him were also taken by the other 3.
And in song:
Money (that's what I want), A whole lot of Money (that's what I want)...
You Never Give Me Your Money, You only give me your funny paper...