Take a stroll through the big fish spreadsheet linked in the sticky above. Notice how many of the fish were caught with "no bait". It's because the bonus baits give just isn't worth the effort to use them. Several fishermen have said they have 1000's of unused baits stored up because they are a waste of time. I believe Mark was quoted as saying they add 1-2% chance to your success rate??? That's Abysmally low. Maybe each application of bait should add say 1/4% chance as your wasted bait acts as chum? So after like 20 applications your chance has now improved to 5%. This could reset upon catching the desired fish, switching baits, or failing to continue use of the bait.