Buddy, honestly, if people know, they're unlikely to share that with you on here for free. Especially with not even a free cookie offered?
If you're looking for a new niche site idea. Then you should first think about the interests that you are most passionate about.
Something you have a lot of knowledge or interest in. That way you are more likely to succeed with it if you actually care about it as opposed to doing something you don't care about like ugg boots or something.
As for me, I am more than happy to share my ideas for niche sites as I have many, most of them anyway, others I'm still working on in my mind, some on paper. Some up and running.
But that's how it usually goes for me. Otherwise, for ideas and inspiration, I try to find solutions, answers and fixes to peoples pressing problems.
I use Google Trends and recent buzz words. Try to find new things as they happen and jump on the bandwagon and catch the early gravy train.
There is no bad business there are just bad marketers. In other words, a large enough audience can make a large enough profit in most every category. There is a process to it. Traditional rules of solving problems for profit as well as sales will continue to produce the best outcomes for all business arenas online or off.
Something else you REALLY should add to the "What should I sell" equation is, how you'll get traffic.
How you'll get your offer in front of the right people. Otherwise you could waste alot of time and maybe money, and end up with nothing to show for it.
Example, weight loss is one of the biggest markets in the world, online and off, but it also comes with stiff competition. Big players with big pockets. So you'd better have a good game plan or you lose that game.
Getting buyers needs to be a part of the planning process.
It really depends, I mean if you wanna sell something online then you must first conduct a product research for it to work. You will need to do market research as well like what is pretty in demand nowadays. You know it is pretty much hard to build an online business nowadays since the competition is really big. Might suggest you to do some research first.
Before going to any niche it is better to see how much competition in it, and then make a plan about how you will get targeted visitors and how you will convert them in your customers. This is the most important thing to think before starting an online business.
In my personal opinion, at this time we can sell ebooks, web hosting, SEO services, web design, graphics design services,...they are all things that people need. Other that that, it depends on what you are selling and how quality your services are.
I would say products that we don't buy often. For example, electronics or IT products because when we are looking for those products, we want the exact model and the best way to find it is on google. I'm less likely to go and ask every shop available.