I don't have a problem with postal use. It can sometimes turn out to be the most interesting part. I got this one for a dollar because of the condition:
The signed note is from the HOF fighter on the card, Billy Papke, who died in 1931.
Or this one:
This 1914 French PC of Johnson is postmarked 1914 and references a fight in Paris with Frank Moran. It took place June 27, 1914 with Moran losing in 20 rounds.