Are you suggesting that the total value of seized assets they process has no effect on the number of gold stars on their resume?
Civil asset forfeiture does not need to go directly into the pockets of civil servants to create financial incentives.
Indeed it has little effect. Seizing a large amount of money or drugs gives media exposure, and that is good for people's career; but it does not make much difference whether it was 10 million dollars or 30 million, 300 pounds of cocaine or 900 pounds. The gold stars in the SR case rained mainly from the message "FBI sank the flagship of the Dark Web".
Consider that the prestige of a politician or general does not depend on how much money he wastes or brings to the economy.
It all comes from the fact that
those we public servants are managing other people's property (for seized assets are property of the people of the US), and the owners of that property don't know what is going on, and have very little control over it.