Hey there... I'm the National Sales Manager for an oil company that has a heavy focus on the powersport industry. One of our better sales people manages the PHX market specifically as it relates to powersports. I have to say I'm a little disappointed by it, at least for us. It supposedly is one of the largest powersport markets in the US but I haven't been too impressed- large OEM dealers control the market ie GO AZ, Ridenow.
For you though being that it is a large market there is probably some opportunity but at the same time there is a ton of competition both from the OEM dealer side and independent. There are a ton of small garages throughout the greater PHX area that do consignment and have a small for sale area. Motomax Service is probably gonna be your biggest competitor- Mesa, AZ. Very large independent dealer with a big service facility. Scottsdale is an affluent community but there are a lot of options for powersport needs. That's my .02 at least. Hope that helps.