If the gp had said “no one uses it to...” your anecdotal sample of one response would have been sufficient to disprove the claim. However, it is at best anecdotal and at worst completely irrelevant to the actual claim made (i.e. that most BTC users are investing in the currency).
I bought some Bitcoin over five years ago, totally forgot about it, and then remembered I had bought some. I sold it and bought an SLR camera to photograph the total eclipse this summer. It felt like the time I won a few hundred bucks at the slots in Nevada.