My initial statement was not absurd, I stated...
"using multiple domains that offer the same service. The sites are not duplicates, but are extremely similar."
Maybe I should have explained the similarity of these sites more clearly to begin with along with the company's use of throw away domains so you could have fully understood.
What is it that you don't know? If Google should allow sites in their serps with extremely similar content, offering a very specific service (one to be exact), using throw away domain names (domain.com, domains.com, 1domain.com, bigdomain.com, topdomain.com bigtopdomain.com), targeting one type of visitor, all by one company? And then to rank 8 of those sites on page one?
There is nothing that they offer differently from any one of their sites to the next. That's the point I'm trying to make here. How does it benefit the user who is searching for this very specific service to have all of these sites presented as options?