Competition is the key, IMO. How may times have you seen a LMB just staring at your fishing lure but won't strike until it sees another fish showing interest? One time I was fishing in an irrigation pond where I knew there were fish but fished for an hour with a large swim bait with three hooks with no bites. When I did get a bite, there were two fish hooked.
1 ac pond LMB, BG, RES, CC