My neighbor bought a Rivian truck cash when it came out. Sat on it for 4 months then turned around and sold it for twice his buying price while it was difficult

My neighbor bought a Rivian truck cash when it came out. Sat on it for 4 months then turned around and sold it for twice his buying price while it was difficult to acquire. Sat on his hands for 6-8 months then bought another one, which he kept for himself, with the profits. He said he would do the same thing with the Cybertruck in a heartbeat