Erm, apart from the obvious answer, why would you not want to support your local dealer?
The way I look at it is that Honda still has many OE parts/consumables available for our bikes. If you have a good working relationship with your local dealer it makes the whole process less stressful. And let's face it, OE parts from Honda, at any price, last a long time....
I've had very good success with the local dealer here (RTR Performance), not least because Larry the lead parts man is very acquainted with what I need. That's worth a big premium to me.
Another 44 cents worth.