What are those silly things you're talking about? Are groceries silly? I wouldn't say that sustaining yourself is unimportant. I hold to buy things in future, that's a fact. I don't see any other use for bitcoin outside of speculation/trading and saving up to buy things. I'm sure one day I'll be able to do it and believe me, I will not regret it. The ultimate goal of every type of money is to buy us things we need. Without this currencies would be useless. What is silly and what is not is a matter of perspective. For someone who lives in the South Africa, a winter coat will be useless, but someone in Finland will not be able to live without it.