The problem with longer books is that because of production costs, they have to be priced higher, and unless there's some obvious reason to believe that lots of readers are going to be willing to pay the higher price, most publishers are going to be very cautious about really long books. That lower limit has been going up, incidentally. In the Seventies they published novels as short as 45,000 words. And the current limit isn't absolute. At 60,000 editors will raise an eyebrow, but not necessarily reject out of hand.
Some editors never look at the word count on a novel manuscript.
Instead, they heft it, look at the typeface. If it seems really long they will be skeptical and waiting to be convinced. If it seems really short, the editor had better be grabbed strongly in the first few sentences. Market forces make a very short book difficult. They'll feel ripped off.