I have worked for or helped out at an LHS for the last 20 years, and I have to say that being honest with your customers is
the best way to do business. Lets take planes as our example (we are in the plane forum).

Customer comes in and says "I want to learn to fly RC airplanes, How about that 45% carden yak on the wall".
Now ethics comes into play, yes I can sell it to him and make $3000 today or I can do right by him.
So I sell him a trainer. ARF with everything for $350 (I did say LHS not Tower) now for the next month or so
I sell him fuel and props and the occasional odds and ends. Now he comes back and says Sport Plane.
Ok we go Tiger2 with 46ax and some servos and RX for $400. Then props and fuel and stuff for a few months.
well after another 2 planes he decides to buy that 45% yak. At this point I have made $1200 + and he
buys a yak for $3000. And has a 75% chance of keeping it in one piece. I can sleep at night and I have a good
customer that refers friends.

Is it that hard to wait a while and take the small sales that lead to a big sale. And most likely at no time do I have to sell
any customer a Mustang or Raptor PTS unless they definitely want it. The maufacturers don't care about ETHICS, but
a good LHS should be able to reccomend the proper equipment to keep the customer happy and coming back.