It's actually pretty unusual.

Charlie Sheen gave Lindsay 100k because he wants to nail her, not out of some freaky white solidarity.

Beyond that, the only similar scenario I know of is when a dying Ed McMahon was about to lose his home after cancer (and bad financial advisors) cost him his entire life savings, and Donald Trump bought the mortgage (which was 90% paid, ffs) and leased it to McMahon (and now to his widow) for next to nothing.

But to be realistic, McMahon was an American Icon and Trump generally needs all the good PR he can get.