Cash is a minor issue in that, just a cherry on the cake.
I get the point of you (and other answers) of “getting vengeance over an attempt to murder his son” and “making it clear that attacking the Malfoy family will cost you terribly”. But those points are achieved with the deal, as much as with sending Hermione to Azkaban.
Accepting the deal would say “if you attack the Malfoy family, your life will become hell, unless you happen to have a friend who happens to own a blood debt from the Malfoy family and his ready to sacrifice about everything to save you” which is almost as efficient as “if you attack the Malfoy family, your life will become hell” as a deterrent. But in addition grants Malfoy a huge gain in political power, which he can then use to enforce even more efficiently his vengeance (even maybe going as far as being able to avenge Narcissa).
Cash is a minor issue in that, just a cherry on the cake.
I get the point of you (and other answers) of “getting vengeance over an attempt to murder his son” and “making it clear that attacking the Malfoy family will cost you terribly”. But those points are achieved with the deal, as much as with sending Hermione to Azkaban.
Accepting the deal would say “if you attack the Malfoy family, your life will become hell, unless you happen to have a friend who happens to own a blood debt from the Malfoy family and his ready to sacrifice about everything to save you” which is almost as efficient as “if you attack the Malfoy family, your life will become hell” as a deterrent. But in addition grants Malfoy a huge gain in political power, which he can then use to enforce even more efficiently his vengeance (even maybe going as far as being able to avenge Narcissa).