In case you can't read it, this says:

You always aim to see the sights
In every place both days and nights,
You think you're smart but truth to tell
You're fresher than the goods you sell.

Is it possible that someone actually bought this card and sent it to someone? Is is conceivable that there was enough of a call for angry cards aimed for philandering salesman that it was a good idea to mass produce this? Did they have a special section for this in the greeting card store? Birthdays... Anniversaries... Bitter Valentines Poetry For People You Hate...