Why are there rowdy bugs on my blackeye peas?

After I pick the beans off the black-eyed peas, the ants come, and muck round right at the connection point. Then the wasps started doing it too,and I saw one ant run off a wasp. At this point the houseflies are there too, and the wasps are fighting each other for possession of some of the best places on the plants. Always where the beans were picked.
What on EARTH is going on there? Why is there a rowdy, brawling crowd on the bean plants? What are they after? I thought about tasting to see if it was sweet, but didn't care to fight the crowd just for curiosity.

it probably is sweet. many plants have extrafloral nectaries- literally non-flower places that make sweetness. cowpeas, the species that black eye peas are in, have them in a couple places.

Picking cowpeas is about the scariest thing I ever do in the garden!!!