The only problem I foresee is there are absolutely loads and loads of angling websites on the Internet.
Right, too many people fishing in the same pond. That goes for many niches, but if you're lucky, you may find some untapped potential. Competitors can get lazy once they've made their way to the top. That's when it helps to be personally invested in a topic, you just see more that's missing from a user's perspective. I picked up an instrument lately and am toying with the idea of starting a website in that industry, just mulling it over and doing some research, hoping for a way in. It's fun :-) Not really thinking about AdSense, though, since that generally requires quite a bit of volume or a particularly lucrative niche, and I'm expecting neither.
since you clearly have not read my explanations
If there are actual explanations in there, you're drowning them out with all the "fubards", vagueries, and Google this, Google that. All makes it rather hard to take you seriously or even believe you actually deal with global million-dollar shipments in the "real world", but I digress.