I do not think I will buy bitcoin if the price reaches $ 100k, because it is very expensive and I should look for bitcoin through signature campaign. In signature campaigns by getting bitcoin will be very profitable and I will start investing after I get bitcoin.
You're looking at this with too much of a singular mind. What if bitcoin is blowing up even when it is at 100k? If it's increasing by some arbitrary amount, let's say 7% per week, steadily, then why would you NOT want to buy bitcoin? It's much too early to say anything about this. It definitely depends on the circumstances surrounding the situation. Let's take it one step at a time for now and come back to this topic if bitcoin ever hits 100k.