I guess you wouldn't.
I think most would not think oil changes every 1k are cost effective. Last time I checked Mobile 1 is not 5x the cost of a quart of 20W50 dino oil. Add to that the cost of a filter each time. You could save labor costs and change the fluid yourself, but if you have the extra cash for changing every 1000 miles, it is probably no big deal to pay someone to do it.
One thing that is known is that true synthetics have better lubrication at higher temps. Dino oil does not. Syn3 breaks down at about 250F. Mobile 1 is good till about 300F. While it is probably not that big of a deal in winter, if you live where it gets hot in the summer and like to ride, the wider temp range of synthetic is a nice safety margin.
If you haven't read the self help section, check it out. It is long and it will take a while, but just about everything is there. Really. Sometimes it is not always clear, but most of the time it is all there.
Many opinions on this board about maintenance and when, what and how often, what is necessary and what isn't. People differ on how many miles to change their oil, but so far I think 99% agree that true synthetics are hands down, better than dead dinos.
The only time I can imagine that I would change my oil (and all the fluids for that matter) would be if I only put 1000 miles on my ride and I was then storing it for a long winter. Short, relatively low temperature trips (engine operating temp) put H20 into the oil from the atmosphere and it can't boil off. Then corrosion can start.
I ride all year long, as long as the road is ice free. That would be 14-17 oil changes a year for me. HD= Hundred Dollars, but that is too rich for me. I'll keep the oil in longer and buy new tires so I can keep rolling along....
For me, I use Mobile 1. I change every 3333 miles in the summer, when it is really hot and every 4-5k in the winter. My numbers make it easy for me to remember.