Question about the pier and water taxis

As usual, great images that tell a great story of this wonderful place, Rob. How nice that someone took the time to erect shade for all the folks waiting to board the water taxis. Speaking of...I've been thinking about all of those guys that hang around the pier and the dock at Las Gatas. You know, the guys that offer hold your hand and help you into and out of the boat and tell you to watch your head....that's pretty nice. I noticed the boat captains or drivers seem to sort of look the other way as these guys are crawling all over the boat to help guys like me and "The Boss" into and out of the boat. When they start clamoring for and yelling "tip!, Tip for me?" I usually give them a few pesos. It seems though, that they are getting more aggressive. When we were there last October I actually heard "Oh, C'mon, Mister...is that all? You don't have a dollar for me? I have actually given dollars to these kids and sometimes they still ask for more. Look, I'm not a cheapskate, and I am slowly getting used to the idea that maybe it isn't always such a good thing to tip the taxi drivers unless they do something above and beyond. but this situation is getting a little more confounding all the time, and I noticed they never or seldom pester the locals. My question is what do these guys have at stake here? Are they working with the boat owners? Do they just show up at the docks and try to cash in? I'm curious to hear your thoughts. Thanks.