I do not recall a single member of staff outside of a train cab on the budapest metro .With it's abscence of barriers the Budapest metro is the "free" system the newcastle metro used to be (installation of barriers would be impossible without manning them at all times as the OAPs go free without needing to buy any sort of ticket). You could get up to what you like down there. My father does recall plain clothed ticket inspectors invading a few trains he travelled on in the blissful years before I came along, though.
One the other hand, the system's appearance is not neglected at all. Several stations including the important interchange at Blaha Luja tér (where we would change off the number 7 bus from Bosnyák Tér, where my grandma lives) have been extensively refurbished and in the recent modernisation the stations on the first electric underground railway in the world were restored to their original apperance, as in these shamefully stolen images: