I did not get a dog until I was self-sufficient and confident that I could handle her on my own. I live with two other people and we seldom get visitors. I take her out though, even if it's to the drive thru.
The fact that this dog's pack changes so often can definitely influence his behavior. Snipping is very different from a full-on bite. Snipping is often done as a jerk reaction. Maybe someone sat in his leg, or just didn't get enough socialization with other dogs (which teaches them bite inhibition). A real bite, which is much more serious, would get me worried.
My dog can do a full-on bite, but she knows humans are off limits and mouths us a lot. Meaning she'd have her mouth open and her teeth would sometimes graze us, but not hurt, and then she'd lick like a cat's love bite.
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