I have too much Samsung stuff.
Samsung 5.1 system (matches the TV and takes advantage of the TV remote)
Samsung smartphone (lack of other decent options on my contract's hardware list)
Samsung SSDs (despite boycotting them for 3-4 years, nobody else makes SSDs as good right now)
Samsung monitor. (Actually not a Samsung panel, LOL)
It's a combination of good hardware and aggressive pricing.
I would have preferred an LG TV but the samsung was on sale for about 30% less than the LG.
I would have preferred a different 5.1 system but there are really convenient benefits to matching it with the TV.
I would have preferred a Pixel instead of an S7 Edge, but the S7 Edge was the best phone available on my contract.
I would have preferred to continue boycotting Samsung for their treatment of SSD customers with the 840 line, but nobody else matches their price/performance.
I would have preferred to buy an LG ultrawide Freesync monitor but the reviews of it were awful, so I got the Samsung which reviewed well.
Asus, Samsung, Apple - they are companies that are too big and greedy for their own good, and not without some seriously-dubious ethics that have frequented the news - However, their success is in part down to their intelligent sales/business/product strategy. It is not undeserved, or particularly surprising that we find these brands everywhere in our homes