I'm pretty sure people are still making money with this currently. I've been looking through some sellers on amazon and ebay and can clearly tell that their buying from retail sites to sell on those platforms for minimal profit margin. Funny thing about this method I actually made a bit of money from this a few years ago when I use to buy electronics pallets and sell them on ebay/amazon.
In between I sometimes went on sites like woot.com and sonicelectronix.com and dropship items from there to amazon. Also had another site I used tmart.com where I dropshipped iphone charging cases to ebay. Wasn't much money at all, but I really just never thought of scaling up and selling in volume. My mind was always centered around buying something for fairly cheap and selling for 2 to 3 times profit which I realized unless you're private labeling or buying direct from china/manufacture it aint happenin cappin.