When I was a student, I worked in PC World for some time. I started as a merchandiser / shelf-stocker and didn't do any sales. Interestingly, people would ask me questions and after some time, I'd recognise the same people coming over and looking for me as they found me to be far more knowledgeable and honest than most of the sales guys there. I did get the smug feeling when I saw sales advisors approaching customers and asking how they could help and they were told "if you want to help me, tell me where your most helpful merchandiser employee is!"
After a few months, I moved up to being a sales person myself, and it sure was better pay as I'd get commission on my sales. Of course, there's competition between us poorly students wanting the best bonus of the month!
Worst horror story I remember is speaking to some potential customers (a family with two kids in tow). After talking for about 15-20 minutes, it was clear they wanted one of the most powerful PC packages we had at the time. Of course, this turned out to be the most expensive (around £1800 and that's 10 years ago!). I didn't have to upsell for them to want it - they were happy to spend the money as they trusted what I was saying and saw it as an investment.
As it was approaching closing time, I asked them to excuse me for a minute whilst I went to the tills to ensure they kept one open with credit card terminal active. At that point, my supervisor who was a pushy salesman asked "are they taking the extended warranty?" I replied saying no, they're not, and yes, I have explained the benefits but they don't want to spend the extra £600 (a third of the price of the entire PC!) on the extra warranty.
He then follows me back to the customers who were waiting by the PC and he then jumps ahead of me and starts talking to them: "you do realise that the standard warranty only covers the base unit PC and not the really really really expensive monitor that you're buying? If you have a problem even within a year, the monitor's manufacturer's warranty doesn't cover it - you must have the extended warranty!"

The father of the family then said "so you're telling me that unless I buy your really expensive extended warranty, the monitor you are selling actually isn't covered for failures?!?"
The sales guy said "Yup!"
At that point, I was fuming and could see the whole attitude of the customer really changing to being satisfied having received good customer service to being bullied around into buying something really expensive they couldn't see the value and questioned how accurate the "monitor isn't guaranteed" argument! They were about to walk out the store and I was going to lose my big sale.
I then butted back in and pushed my boss out the way (growing a pair of balls at the same time!) and did reassure them that the monitor was covered for year, just not against accidental damage. If it goes pop on its own, you're OK. If you drop it and smash the screen, you're not OK.
Eventually, they agreed to buy the PC package without the extended monitor and thanked me and asked for the name of my boss so they could officially write in and complain about him whilst congratulating me on my advice. Needless to say I didn't have a problem with that
I waited for that month's pay check to come in with the commission from that single sale and then handed in my notice. My boss couldn't believe me and didn't want me to leave. I just had to say "tough, it's partly your fault I'm leaving!"
OK it's not a camera-related story, but from experience, for those who see commission and profit to be of the utmost importance, they're prepared to lie and give bad customer advice just to get it :thumbsdown: