The Monkey's Paw
http://gaslight.mtroyal.ab.ca/mnkyspaw.htm
An e-text of the short story.
The Monkey's Paw
https://www.youtube.com/watch?v=ugjegclLNhM
A 2011 video adaptation, available on YouTube.
The Question and Answer section for The Monkey’s Paw is a great resource to ask questions, find answers, and discuss the novel.
I think the line underlines the tragedy that Mr. White did receive his wish but at the cost of his son's life. The paw and his wish rendered Herbert's life worth a mere 200 pounds.
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Second wish is wishing Herbert comes back to life but Herbert comes back as a zombie.