Believe it or not, some stores sympathise with you. They might actually be run by people like you, people who read your story. They still want to know how you proceed round the store, because that helps them optimise shelf layout, identify hard-to-find items, and so on. So yes, they might use the standard in-store CCTV to observe your journeys, and when they figure that you and people like you always have difficulty…
...when they figure that you and people like you always have difficulty finding the eggs (seriously - why is it always so hard to find the eggs?), they'll move the eggs somewhere more prominent, so they can sell more eggs and you can buy what you came to buy.
You think that stores are in business to sell you eggs, and are slightly puzzled that eggs aren't easy to find. But you confidently continue proceed despite direct evidence that stores don't act like you think they should.
The answer to your question is that stores are in business to sell you as much as they can, and the eggs are just there to get you to see everything they have to offer. If they made it easy to buy eggs then your life would become easier and they make less money.
Stores know this because they hire consultants who tell them what to do. And the ones who refused, made less money then got out-competed or bought out by the ones who followed the advice. Now they all know to bury eggs, and the big ones make each store's layout different so that they can maximize how much consumers wander.
You know what else those consultants told them? Candy bars are high profit items, but nobody is going into your stores to buy junk food. Those are impulse buys. So put them right where everyone is forced to stand and wait for the cash register to make it as hard as possible to avoid the impulse.
Look down the cereal aisle. They put cereals with healthy branding at eye level for moms, and the obviously exciting cereals at eye level for kids. Note that branding and reality are unrelated. Take a look at the serving size and sugar per serving on all the boxes. No matter what the branding, most of the cereals work out to be about the same.
It goes on and on. Marketers have fine-tuned their art to a science. No matter where you look, they have mastered details you wouldn't have thought of. And while they aim to hit your emotional buttons, they do NOT fundamentally aim to please YOU. You're not the client. The store is their client, and your being unable to stop opening your wallet is the product that the store is buying.