A few things come back quite often. Most people agree that it's a bad thing to lend your knife to others, that it's okay to buy more than you actually need, that there's no ONE perfect knife and that cost doesn't equal quality.
I agree with all of those and most of the other stuff that has been said so far. Especially the "don't lend your knives" rule, most people aren't ready for that level of sharpness and just don't know how to use a knife, period.
A lesson I've learned recently is that expensive, "super steels" are still just steel. If you cut food on a ceramic dinner plate you're going to ruin your edge. If you cut dirty carpet, you're going to ruin your edge. If you accidentally hit the ground with your blade, you're going to ruin your edge. My point is, no matter what steel you have and no matter how much you paid for it, it's not a miracle material. People have crazy expectations because they paid crazy amounts. You will get a better steel if you pay more, but it's still just steel.
A lot of people abuse their knives. It's okay to test them for Youtube and go to extremes to see how much it can take, but prying open a car door with a folder is unrealistic and stupid. (I have yet to see someone actually expecting that from a knife, but you get the point)
The less expensive knives can and will do most jobs just fine. If you know the limitations of a knife you will work accordingly and use the proper technique. When you do that, you don't need a bomb proof piece of steel. I often find myself using my Moras and not needing more than that.
Steels are like Pokémon. There is no ONE perfect steel and all of them have strengths and weaknesses. Trying to find THE absolute best steel for everything is a total waste of time.
Sharpening isn't that easy, but is a necessary skill for any knife enthusiast. Learning how to do it properly is worth it.
I'm sure I'm forgetting a few things, but I guess I can just come back and write them later.