It is generally considered a bad thing to buy things that you don't intend to use, add no value, and sell them at a markup merely due to the fact that they are

It is generally considered a bad thing to buy things that you don't intend to use, add no value, and sell them at a markup merely due to the fact that they are scarce (artificially, because you bought so many and are controlling the market). It is considered to be good to buy things that you don't intend to use to resell them if you are adding some kind of value in the reselling; for instance, people who have a local retail store, who are adding the value of being close and convenient, rather than having to go all the way to the producer. Domain squatters are adding no value. If you just buy a whole ton of domains speculatively, and then sell them off at high markup because so many domains are gone that it's impossible to find good ones, you are adding no value, you are only taking advantage of an artificial scarcity for your own profit. We have plenty of other negative words for this kind of behavior in other domains. Ever heard of a scalper? There is really no significant difference between a domain squatter and a scalper; they are just people who induce artificial scarcity and use that to run a profit without actually adding any real value.