It's more down to sloth. If sellers actually took good pictures, don't making any spelling mistakes, and don't omit any important information, they would have a much easier time selling. However, if you know what you are looking for, spelling mistakes might actually help you. That $40 Record vice would probably have been snapped up before I could get to it if the seller paid closer attention to the sticker with the last two letters missing.
That's more or less how I feel.
When I list items, I aim to make the listing as helpful and user friendly as I can while not expecting top dollar - because that's the type of listing I want to see when I'm buying.
For buying, it feels like many of the sellers (with exception) don't really care to actually sell the item they're listing. They just snap a blurry picture on their phone with a five word description and expect the buyer to understand what they meant or what the item is. Then they won't respond or get upset when you ask for the basic sort of information that should have been in the ad in the first place.
I've also gotten lucky with misspellings or ads with nice products and zero information. It's fun when you get a deal, but I'd prefer looking at better listings over trying to decipher what I'm looking at.
To the OP's point, I've noticed hidden labels or misrepresented items plenty. Sometimes those same listings pop back up day after day for years. Some used HF item will be listed at snap-on pricing saying 'FIRM'. I used to get frustrated enough to call them out on it even if I didn't want the item, but now I just ignore that sort of thing. Some people are ignorant, others are trying to scam a few bucks out of someone.
Lately, I've been having a friend list some of my items for sale while he stays in my house. While I don't want to micromanage, his listings are more or less the epitome of what I don't want to see as a buyer - little to no info, mediocre pictures, wacky pricing (I gave him general direction but let him set his own prices since he's getting commission). He's having mild success though, so who am I to judge?