Packeagle's response got me to thinking.
On the HH two dissimilar fabrics, with different yarns, weaves, and stretch characteristics are joined. Having a bias tape reinforcement is probably a good idea in such a situation.
If the edge of the hammock you sew, er, inject is a simple edge with no net attachment I bet that the rolled hem would be just fine. Of course, if I was the fabricator I would use bias tape too (Disclosure: I am a "Heavy Hanger").
with no real-world experience in sewing a hammock!