If they DO "flop on the couch" to get a role, what does that say about they men the "flop" for? Seems they are not beyond reproach as well, right?
In many businesses, you get people with power using it for personal advantage. Whether it's a purchasing agent giving business to the supplier who gets him football tickets or the casting director accepting "free samples", it's not uncommon.
The intelligent ones balance immediate self-interest with long-term self-preservation. If your choice is between two suppliers and their bids are about equal, you can safely go with the one who wined and dined you. If you give a part to the girl who gives you a nice time, but she's terrible in the part, you won't stay casting director for long.
One woman I know used to be in investment banking. She was telling me that she had to sleep with the power brokers to get in on the good deals, but there was a "glass ceiling" on the deals she could get in on. It did not occur to her that her favors evaluated to be worth the risk of her screwing up a $N deal, but not worth the risk of her screwing up a $10N deal. She's also bitter that she got eased out after 35.