Exactly. I never understand why people have a problem with people speculating and investing in bitcoin. The only point in investing is to sell some day and realise a profit.
Investment for future sale is certainly one potential use for bitcoin, but many people may be looking more into exchange from one currency to another with a long term plan to simply spend the bitcoin directly on future purchases.
Lots of people invest in land and property which are finite resources but they still change hands, people die and people sell up.
Just like bitcoin has uses beyond pure investment, land also has uses beyond pure investment. You might buy some land to have a place to live, or to grow your own food, or to provide a place to go hunting, etc.