I don't think its in good taste, but I don't particularly care either. I've always had a good camp on every river trip.
One time on the lower Owyhee many years ago, we pulled over to take a look at the sweet petroglyphs upstream of Greely Bar. There was a big group there looking at them already. As soon as they saw us coming down the river (we were on a 1 boat trip), one of their crew went running back to the boat and jumped in and took off just as we got to them, leaving the rest of the group behind. They stayed at the petro site for a fair amount of time after the lead boat took off so they were not in the process of leaving as we showed up. I presume the lead boat took off as soon as they saw us to go snag the Greely Bar camp (nice camp with hot springs). My wife and I were unconcerned. First, there are lots of camps. Second, we did plan on camping at another site that is not marked as a camp on the map that has easy access to the hot springs. So we took our time and enjoyed the petroglyph site. The big group eventually took off (they were a private group incidently) and we slowly moved down stream and got our stealth camp. After we got our camp set up, we hiked the short distance down to the Greely hot springs. No one was there for a soak but us. After about an hour, just about as we were thinking of putting our clothes back on and heading back to camp, the big group comes plodding up the bank making a ruckus looking for the springs, they come around the bushes and low and behold was a naked samsquatch in their pool. They were quite surprised to see us there, thinking their plan to send a boat to run down and snag the Greely bar meant they didn't have to share the springs. As soon as they got a gander of samsquatch in his birthday suite, they beat feet back to their camp. We got packed up and headed back for a wonderful night. Never saw the group again.
Samsquatch robbing the tub from the camp runners:
On the Grande Ronde last year, we came onto a group that was obviously scouting hard for a camp. They were pulled over at a stream delta that has a camp marked on the BLM map, but there hasn't been a camp there for years since the stream blew out in a huge storm. As soon as they saw us coming down stream, they all ran (litterally) back to their boats to get in front of us. We know exactly what they were doing and played it cool. They ended up launching and getting into the middle of our group of boats then rowed hard to get in front. I had a brief and cordial convo with one of their boats, seemed like the group leader, but made a couple low-key remarks about they must be on their first trip down the river, that spot hasn't had a camp for over a decade since the last big flood/blowout. Mean while we were unconcerned because we were shooting for a camp that is not marked on the map and it was only about a 1/2 mile downstream. As they rowed hard to get in front we slowed down to let them. They of course passed up the beautiful camp (that you can't tell is a camp until you are too far downstream on the wrong side of the river to catch the landing if you are following the main river current to haul ass in front of a group). We had that lovely camp and they landed at the next bend on the opposite side of the river (within sight of our camp) at a place that is marked as a camp, but actually is a terrible camping spot on a very sloped beach, which most folks only stop at for lunch.
Too focused on the map and what we were doing, the camp running group passed up this great camp not actually on the map, if they had not been pushing hard to get into the fastest current to get around us, they might have indeed realized a pimp camp was at hand.
So much for the benefits of sending a boat racing downstream to get in front of another group.