Same! I find the alerts come at times when there are no holidays or events. Like on a random Tuesday afternoon in the middle of June I get an alert that a game or movie is $20 when it's been $40-60 the last 6 months. Prime Day comes around and it's "on sale" for $55.
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.