hahaha it is a risk!! I had a falco hawk with a cleaner shrimp for ages - but he was well fed....... the hawkfish ended up in a separate tank as he wasnt getting along with my other tank mates and I moved that very same cleaner shrimp into the QT that the hawkfish had been living in as I was running an interceptor treatment on my main display, and within a day my cleaner was dead, and the hawk had antenna sticking outta his mouth.
The shrimp was way too big for the falco to eat tho - so really all he had eaten was the antenna.... not 100% sure what killed the shrimp, but awful coincidence I say hahahaha - the falco was horrible neglected in the QT setup - never fed... so I guarantee he was desperate for food
I really don't mind the cost associated to a nice feast for my hawk. Peppermints are only $4-$6 depending.. And i used to feed feeder fish to my freshwater to fill that need to hunt. I would assume the benefits for the saltwater predators are similar. And besides, who doesn't like a nice fresh shrimp dinner! Well maybe the shrimp....