Earlier quoted context omitted.
Seems like a good idea to me. Are you thinking of small or large values for $X and $Y?
I think appropriate values would be whatever it costs to file a lawsuit in the relevant court, plus a transaction fee for the escrow service. DMCA takedown notices were sold as a way to get quicker action than filing for an injunction, but they should not be usable as an alternative to a real lawsuit. If you're sending a takedown notice, you should be prepared to follow up with a lawsuit, including being on the hook…
If I am a small indie label protecting my artists why should my fee be extravagant? But if I am say, a subsidiary of Disney, maybe I can bully my way through the system and acquire more IP because I have access to capital.