If you read the fine print on the filter box, the really fine print... This filter is designed for 1500 miles of use. I paraphrased it, can't remember the full amount of the printing. New filter every 1500 miles? At $3 a pop, why not. Yes $3 per filter. For the EXACT same thing the dealer charges $7-10 for. Combined with car oil, I can get 2-4 oil changes for the cost of 1 using "motorcycle synthetic oil" and Suzuki filter. $4-7 for a filter box...stealerships doesn't EVEN begin to describe it...
Oil filter $3. Oil $1.94 a quart. 91-93 octane gas $2.55 a gallon. Terrorizing the neighbors? Priceless.

-WD
And, MY costs will go down even more once I'm working at the bike shop...
FWIW, you really DON'T want to know the mark up on sparkplugs, air filters, etc.