What makes people tempted to buy unnecessary things instead of putting their money into investments is their mindset. A person who makes that right investment will sell their bitcoin for another investment, not for nothing.

Therefore, make your goal firm and straight. Make a decision that you can benefit from rather than regret. If you are planning to have passive income from investing in bitcoin, then never think of selling it for useless stuff. Focus on your goals and you're free from temptation. We don't make ourselves hard about it, because we can do it if we are 100% committed to our goal.