Multiple sellers

I am littlebit confused n wanted to know how things work on Amzon when 1 product is being sold by 50 different seller under 1 listing and with huge price difference… e.g. I was looking at 128GB SD card and there are approx 45 sellers listed with price range from £18 to almost £30 so I am just wondering in this case seller who is selling above £20 how exactly they manage to get sale? Obviously 80 to 90% people would buy cheapest…
Could you please throw some light how all other sellers are making profits?

Answer:  Some sellers don’t make a profit. Some are unaware of all the costs associated with selling on Amazon. Others decide how much they need to charge for a product and maybe hope that other sellers might go out of stock at some point so they can attract a sale.
Selling on Amazon is high risk. Personally, if you are looking for products to sell, don’t bother with those who have high numbers of sellers.
Basics economics will show you that with a commodity product it’s just a race to the lowest price between the competitors.
Find a unique product, preferably one created by you if you truly want to make real money.