Yup, I've been on both ends of the spectrum. Worked for Jiffy Lube while I was finishing my education, now I'm at a dealership.
We weren't THAT bad, we didn't sell easy jobs like trans flushes and just not do them. But occassionally you'd get a fuel filter that was completely rusted onto the lines, tell the manager about it, and they'd bill it anyways. Of course we would recommend things like filters and fluids constantly, if the customer isn't smart enough to keep track of their maintenance records and they replaced that same air filter 4 months ago, that's their problem. You don't make any money on a $19.99 oil change. Just like at a dealership, the cheap lube coupon is to get the customer in the door. You make your money on everything else that you sell them.
Now that I'm at a dealership I see things from the other end. Had a Toyota Solara that had the wrong oil filter on it and destroyed the engine. 2 Jiffy Lube "reps" came out and looked at the car right in front of myself and 2 other techs and kept saying it was the correct filter, even though it was clearly too small to seat the o-ring on the surface, and the car would leave a puddle of oil in a matter of seconds.
At least once a day I'll get a car that's been taken to a cheap lube place and find the drain plug all messed up, rounded off, over-tightened, stripped threads, and I won't touch the car until we confront the customer about it, because I'm not about to spend 45 minutes tapping out the threads in the oil pan for something I didn't do.
Bottom line, Jiffy Lube is there to take advantage of people. And it goes full circle, because the only people who would ever trust a quick-lube place are the ones who don't know how to take care of their vehicles, and they're easily taken advantage of. Jiffy Lube is there to make money off of suckers, and there are plenty of them out there. You're supposed to take your vehicle to the dealership. Hell I do $17.98 oil changes all day, even cheaper than Jiffy Lube, so there's no reason to take it to a place that employs high school kids who are PRESSURED to sell dishonestly like that.
Frankly I don't feel too bad for a lot of those people. Those are the people that come in with a quick lube sticker on their windshield, and then when you try to sell them needed maintenance as a factory certified mechanic, they act like you're the dishonest one, "why didn't Jiffy Lube tell me I needed brakes, I was just there two months ago". Why? Because they don't care enough to look at your brakes, jerk.
I had a lady like that a few weeks back. Her car was towed in. Right front wheel the brake pads had FALLEN out from wearing so thin. Of course as I proceed to do the brake job (NEW rotor, new pads), I find that the caliper piston had come out too far, passed it's seals, and I couldn't get the piston to compress back into the caliper. We walk her out into the shop with my service manager, tell her that in addition to the brake job, she needs a new caliper, and she goes ballistic. "I come to the dealer ship EVERY TIME, why didn't they warn me that my brakes were so low, you're supposed to do a free inspection every single time, this is ridiculous, I'm not paying for this!!!". Of course she ended up buying the caliper, I finish up the job, hop in her car to pull it back into the service aisle, and what do I see, the most recent service sticker is from FIRESTONE SERVICE CENTER. Yeah right b****, you come to the dealership "EVERY TIME". Go get ripped off at Firestone again.
So whatever, these people act like they're such victims, but they have the opportunity to bring it to the dealership and have quality work done, but they want their $20 five-minute oil change instead. Yeah it's a free country and we can't force you to come back to the dealership. In an ideal world, you could go to a Jiffy Lube and not get ripped off. But that's no gunna happen.
And as far as the other comments in this thread about working for a dealership and being encouraged to have comebacks... I don't know where the hell you work but that certainly doesn't happen to me lol. We get our asses kicked if someone brings their vehicle back sooner than expected. Maybe we just have enough work/customers that we don't need to create more.