FYI:

Squatters: the professional "lingo" term in this field that describes one who registers a domain name and holds it with the intent of selling it later at a higher price.

The rational is comparable to playing the stock market, in a way. Buy one now, and wait until the value goes up enough to a satisfactory price and make a profit. A word or phrase that doesn't make sense now may become a popular term/catch phrase in the future. Folks may want that name.