Hi
most of those registrations could be seen as speculative, depending on the keywords.
single words like game, casino, sex, etc. will get registered in every extension, while some other words or phrases will have less.
it's the "hope" that the next buyer in these categories will choose one of their names, in a different extension, because the .com is either in use or the price is too high for most buyers.
having the alternative, with same keywords, is the prime motivator.
imo...