When a company who makes millions of dollars yearly needs to build another website what would it buy?

1) 18k or 180k is not big money to them.
2) When they will spend their money on advertising, people will remember pharmacy.net but no one will remember ph4r1234677122.net, so their project will fail and money on advertising will be wasted.

Domain should be memorable. You don't want to advertise something people will forget after one minute because you want your advertisement to work and since the advertisement plays key role in any business, bad domain in many cases will determine the success or the failure of a project.