That does happen! I spent 25 years with a Central Distributor administering warranty for Kohler, MTD, and Yazoo. Unfortunately, once you authorize a dealer to make repairs to your machine and you go ahead and pay them for authorized repairs, in reality, the OEM becomes a third party to your and the dealers transaction. Now repeated complaints against the same dealer might cause the OEM to get involved in some way. And the most that will probably happen is that dealer losing his ability to collect warranty reimbursement from the OEM. But today like stated earlier, it's a lot harder to double dip than it was in the past with online filing of warranty claims and ESA certification etc. About the only recourse an individual might take in that situation is through a court sponsored remedy like small claims court and even then your going to have to cough up documentation that's probably not going to be available to the general public. And these double dippers know all that. It's best to always deal with someone you know is reputable even if you have to pay a little more for the machine and/or work performed. The cheapest way isn't always the best way!