There's a difference between the vendors and the higglers, at least to me. I actually look forward to seeing the vendors, like Neville and his patties, Dean and his jerk pork, the baked goods guy, Ricky the juice guy, etc...
What I don't look forward to, but don't mind too terribly, are the higglers trying to sell dope aggressively or "jet ski" salesmen that won't take "no" for an answer. I just say "Got everything I need, brother. Respect." and just keep on walking...