The better the conditions are for surfing, the more surfers there will be out in the water. More people want to surf bigger waves in warm water on point breaks than smaller waves in cold water at a beach break. That’s just how it is, so don’t expect to show up at the beach and be the only one there with dozens of perfect waves staring back at you. That would be really rare because the word will spread quickly.
It’s the same in business. Something that you notice is bound to be noticed by others as well. If you think you can buy something for a lower price on Amazon and turn around and sell it for a higher price on eBay, well then can be sure at least a hundred other people have had the same thought.
This doesn’t have to discourage you. You can still catch a nice wave at a crowded beach on a sunny day. People are doing it, so why not you? If you surf long enough, you’ll catch the waves that look like they were meant just for you. If you try different business ideas long enough, you’ll find the ones that are right for you.
Just don’t expect a beautiful beach to be empty on a sunny day.