I hope this will not be categorized as buying related question because my question is not really on should I buy this or this.
I usually find some parts kits, usually resistor/capacitors/trimpots, like 100 caps for 2€/3$. I've already try one pack of these from Kemo, the values in the pack are totally random but I got some good surprises too (like a bunch of 10K 1% resistors and 550ohm 2% resistors). For the moment I just use them when prototyping the project.
My question is do you know how they can be so "attractive" from a pricing point of view ? I have my little idea, but not sure. I think it's most of them "old parts" or unselled stock from closed companies. (due to the "look" and some have a bit of corrosion). I ask because I've also thinked at a moment about harvested parts from broken electronics as some "feels" like harvested parts.
Do you have any ideas about these cheapos parts ? Is it a dangerous choice ?