yes, they absolutely can (I did not say DO) make money, IF you can sell that much, then you're making money.
for many years in the late 80s and early 90s i sold furniture on commission. it wasn't a scam - but some full time salespeople made about 17K per year. and a few made about 80k per year. in the early 90s 80k was a lot more than it is now in terms of buying power.