Anywhere in the world, any area that sees a lot of tourists generally will attract street vendors, beggars, and hustlers of all kinds.
Southeast Asia is no different, but the local customs and culture are somewhat more permissive towards street vendors. It is, after all, a thriving capitalism. Here is some very level-headed advice about dealing with persistent hucksters, which you’ll soon realize pose no real hindrance to you.
Balinese authorities are of course very sensitive to issues that affect their tourist trade, so most package tours and upscale villas have strict policies about keeping the dregs of the street trades at bay. Really, it’s nothing more than you’d expect to encounter in Baghdad, Singapore, or Las Vegas.