They do restock. They restock along with all the other items at the same time but people get them at the low prices to resell it for higher, and it usually gets sold out fairly quickly.
I was at the market on April 1st when it was restocked and it was bought out literally within minutes, noob items are always the fastest to sell out because they are cheap, and like Star said, become rare and sell for more.
[7:19 PM] Aliosa: Can't have loopholes if there are no loops.
[9:14 AM] Viddah: Just remember if you step on toes youre gonna have to suck on them to make the pain go away
[9:16 AM] [Faux_fan]ancient: put me in the screenshot