A dealer will make between $60 and $100 if they supply the tire and fit it, there actually isnt much wrong about that if you think about it considering the prices of Z rated specific profile car tires.
I used to get my tires from the same suppliers when I owned my shop and it used to bug the hell out of me when guys would bring in their own tires to be fitted and they always neglected to tell you how much they paid for shipping and how long they had to wait for delivery when arguing on tire prices
As for independant shops taking trade, that seemed to fade quite quickly once the dealerships figured out they could sell new bikes with aftermarket pipes etc. , all on finance.
I was relishing the thought of the new line of Gixxers that appeared in the late 90's, I even thrashed it out with Yoshimura to become a registered dealer,only to find that the dealers were fitting cans and incorporating them into the price .
Where I used to make money was on the carburetted bikes like the ZX9's and CBR's but that faded into nonexistance when all these plug and play bikes appeared.
The motor trade in general gets a bad rap and there doesnt seem to be any distinction in skill levels , you're a mechanic or your a sales person or a service manager, as a mechanic you rely on your reputation and not your skills or knowledge to get trade, some get lucky, some dont.
Where the dealerships fail is there is no personal involvement and the mechanics are locked away from the outside world, this is beneficial for the dealer as there is no time wasting with customers and their needs and there is no liability for customers walking in the service area, people like personal service and involvement with their investments, its a bit like going to a restaurant where you can see the food being cooked as opposed to the kitchen being hidden, there is always that thought in the back of your head on wether you are getting somebody elses left overs.
So the independant guy carries on struggling and his thoughts of being a millionaire fade with every morning alarm bell, but what a great guy for fitting tires for next to nothing, he doesnt carry much stock as Wallmart have cheaper oil and filters and the WWW has every aftermarket part available for the same price as his cost.
Just ranting a little.