From Brotato Wiki
Bait provides a significant amount of Damage at a cheap cost, but it comes with a risk.
At the start of the next wave after aquiring a Bait, between 7 and 8 Lamprey enemies will spawn at the start of the wave to chase you down.
The Lampreys are quite dangerous enemies that will charge you while firing projectiles. However, if you manage to kill them, you'll earn yourself an additional 7-8 Materials, making Bait even more Cost efficient.
Will you take the Bait?