True. I'll probably be flamed for saying this; however, I think when you obsess over every little detail, and call things defects when they're not...then you really can't afford the bag to begin with. Just because there's that money in the bank, doesn't translate into its equal purchasing power. Has nothing to do with one's salary, but whether there's retirement funds saved, level of your expenses, etc. Of course some can buy the bags with financial ease, but just feel uncomfortable about the pricing-and that totally makes sense.
Probably also true for some.
Me, I'm just "particular"
a fussy buyer 
If I pay for new, as new or excellent used condition that's what I expect. I don't care about little quirks, it will make my bag unique. My most recent new to me Bal City (the one in my avatar btw, oh, did I really mention it before?!

) has a quirk only visible to authenticators, but it's authentic and came with all Bal receipts and tags. But I don't accept faults and details, even small ones, or sloppy packing/shipping handling that could potentially become a problem later on. If you send a brand new from a store Proenza Schouler to me with an unclosed staple in the dust bag pointed at the bag

and luckily there was only a super tiny mark that's disappeared now, I will demand a refund because you don't treat my bags or my money like that. Yes, it happened and I got a refund
I think the problem is if a flawed new bag or expensive pre-owned one also comes with less than stellar customer service and I think it's this combination that mostly upsets buyers? Just as some customers/buyers are c***p, so are some SA:s/sellers. It can be a harrowing experience for somebody who's finally worked up the courage to enter one of the luxury stores to buy their dream bag. Maybe saved for it for a long time. And is treated condescendingly or pressured in to buying an inferior quality bag. It happens. Or decides to trust a seller who's maybe a member here, and buys an expensive pre-owned bag that turns out to have been rather overrated in the listing description. It happens.
I mean, what ever your means and purchasing power, you have the right to common sense good customer service regardless. And a bag with the quality corresponding to the amount you are paying.
But yes, it's good to know your current economical possibilities/limits and if you can only afford one or two luxury bags, think it through, think it through, think it through before you buy! And I think
leechiyong is right, many of these bags are luxury bags, and some are delicate and not supposed to be carried around daily like a workhorse bag unless you for whatever reason don't care about the wear.