I agree in principle, but I got burned one time doing that. I had a lake house and bought a boat from someone else on the lake. Boat was three miles from my house, but I didn't have a vehicle big enough to haul the boat and trailer and put it down the ramp.
Mentioned to my neighbor I was going to rent a truck and he volunteered to get it with me with his pickup. On the way back I suggest we stop and put some gas in his truck, figured it's the right thing to do. He stops and starts gassing up the truck. This was about 10 years ago, I figured $20 worth of gas would be fair. He's pumping, I see $20 go by, I see $40 go by, and it clicked off at almost $60. This was for a 6 mile round trip. I could have rented a truck at U-haul for well under half that amount.
I don't say anything, but I'm a little pissed, maybe more than a little. Unfortunately, the event got worse. We put the boat in the water at the ramp and I start it and drive it over to my slip, about 1/4 mile. Starts getting sluggish and I notice the previous owner had pulled the drain plug and the boat was starting to fill with water. I tie up and fortunately find the plug in the back of the boat, but can't reach the outside drain hole to screw it in. Meanwhile, the water is rising.
This is March on Candlewood Lake in CT, but here I am dropping clothes quickly and enter the water in a t-shirt and underwear with the plug. I have to dive under a few times until I finally locate the hole and I'm able to screw it in. By this time I'm on the edge of hypothermia, coldest I've ever been, and shivering uncontrollably. Run home and take a hot shower.
That part had nothing to do with the neighbor, but I just thought the whole day was a disaster. Of course now I just laugh about it.
Thankfully, it was a good boat.