It means if you are experienced in something, then it would make you happy to buy it.
He's a priest -- he's marrying them to other people, not to himself.
The literary device would be personification. This is because personification is when an author gives inanimate objects human qualities or actions.
Example:
The blades of grass danced through the meadow to the wind's hypnotizing beat.
In this sentence, the blades of grass dancing illustrate how grass sways when disturbed by wind. Because grass cannot dance this is a personification.