Have any buyers explored (or heard of) incentivizing sell-side brokers to prioritize socializing new opportunities with you before other contacts with a fixed or variable "success fee" included in the close price (paid by the buyer)?

Does this defeat the fiduciary of the sell-side broker to their client?

Ex. 150 Basis Points contractual success fee - Transaction Value $3.3mm - "Bonus" to sell side broker paid at close =$49,500.00