... they'll be watching the Floo Network, and it's more than our life's worth to set up an unauthorized Portkey." ...
[From Harry Potter and the Order of the Phoenix page 51] What does "more than our life's worth" mean?
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Sign up to join this communityRoughly, it means "not worth the danger".
The implication is that the risk in setting up an unauthorized Portkey is very great, and that someone who gets caught setting up an unauthorized Portkey will suffer greatly, so that the benefits of doing it are not worth the risk.