I literally just used this site last week to set up a price alert for a purchase.
Noticed via their chart that the item I wanted to buy (an air purifier) went on sale every few weeks from $340 to $199. I set the alert for $200, and the next day it emailed me saying the price had dropped. Saved me 140 bucks which was awesome.
This has just opened my eyes. I get it now.
This whole thing makes sense.
Thank you.