Yeah people do it purely to fuck with you. For example if you're the only one selling something, someone will pop up and undercut you by 5-8k or more at times even though you can make quite the profit.

Last sold was 120k a few months ago and haven't been seen since in any market, so you start making it and sell it for 80k due to lower price on mats etc, someone pops up and decide "hey, I want to sell this too now!" and sell it for 20k.

I mean really?