I guess if you consider my thoughts on WMO, I would be considered negative by some people. To me, if you want to sacrifice your injection pump to save thousands of dollars on fuel, then that is your choice. Subtract the cost of getting a new pump every few years, you most likely will still come out ahead depending on the price of fuel.
My caveat to the argument of whether WMO does any damage to the pump, I challenge anyone who cleans up the WMO as good as they can, to start putting it in the engine. If you feel that is too risky, then I say you are admitting it does cause wear and damage to the injection pump.
I personally do not want to mess with my pump after so many years, so I choose not to use it.