In the last two years, I have spent quite a few bitcoin to buy the mining equipment to get more bitcoins.
yeah i have used it too but for getting more hash powers in hashflare but after halving i stopped investing to it as the profit was gone half, and now a days i am using bitcoin only to buy phone refill and domains/hosting(online services) only !
Spend it only where you are comfortable and be sure that you are not being scammed as there are many sites available at a moment who are busy in scamming people.