Most dealers do buy it in bulk, at least the ones down by me. It’s a better deal!
Regarding price on 3-year service, I change the lower unit oil myself, and have the dealer replace the water pump and plugs. Think the cost was around 400. I used East Troy Marine.
The software update is interesting to me. I have a 150 hp 2010 Etec, and to my knowledge have not had any updates (unless the dealer did it and didn’t tell me)
Lastly, I have not had any fuel issues (or any issues outside of 3-year maintenance) but I do put a splash of sea foam in every tank. Before winterizing, I fill up the tank, and add a full can of sea foam - have not had an issue...
My Etec has around 1,500 hours and runs the same as it did when it was new - really couldn’t be happier with motor.