Majority of the stores where I live would deserve every single last red cent wringed out of them as possible, they are a bunch of rogues. I have often gone in when the main aquarium section people have a day off so I can purposefully try and get a bargain from employees who don't know what they are doing (Yes, I know, I am destined for hell in a handbasket when I die, just as well only the good die young, at this rate I'll live forever

). The way I see it, they do their best to rip their customers off at every opportunity (and have even bragged about it with customers in the store at one place) so bugger em, I take em for all I possibly can. I have scored plenty of stuff way cheaper than I should have thanks to deceitful timing and have no qualms or conscience about it, they'd do it to me.
On the other side of the coin, there is a store I frequent all the time who have workers who often do me favours (throw in extra glass shrimp, twice as many blackworms than normal, etc. One of the girls there likes me and gives me a ton of freebies, she makes the missus want to stab her in the eye with a fork - the missus' words, not mine - but she is good for my fish, especially my eels. It's amazing how many blackworms a flash of a smile can be worth

) and I don't rip them off and often help them out with fish info, etc. They talk to me for ages sometimes, pickin my brain and I guess they like to return the favour once in a while, that coupled with how much I buy from them on a regular basis.