As I understand it tipping off is an offence under the money laundering regulations!!!
The purpose behind it is to a: Increase the scent trail, two baits will give a larger scent than one and
b: is that the different colours contrast against one another and are therefore more visible.
c: Finally, a flapping tail on a bait creates movement which also helps to attract a fish's attention.
tipping a hook with a certain bait at the right time can mean the difference between catching and not.
what you tip with will vary on the species your after and where your fishing for them.
never start a session with all your hooks tipped off. use a 2 hook rig and only tip one until you find what the fish want and if they want tip baits of not.
if your getting bites and missing them and after reeling in you find the tip bait is still left on the hook but the bait on the back of the hook is gone imediately stop tipping your baits as the fish dont want it. you,ll find that you hook up straight away.