Of course they do unless they are asocial hermits who never interact with sighted people.
Its like any other purchases that they make of life’s necessities. You don’t have to be able to see in order to buy lightbulbs. You just ask for the wattage you want and pay for it.
I’m having difficulty understanding why this is even a question. Blind people aren’t THAT different from the rest of us. They’ve just lost one ability; that of sight. They didn’t suddenly lose their mind also. They certainly don’t expect any of their sighted loved ones or guests to stumble around in the dark. As incredible as it may sound, just because they’re blind it doesn’t prevent them from awareness of the needs of others. Someone would have to be extremely stupid not to realize that. There is no correlation between blindness and extreme stupidity. They’re just as smart and aware of things as the rest of us.
Why on earth wouldn’t they buy lightbulbs? Unless they live in a cave, light bulbs are a necessity just like a whole bunch of other items used in daily living.