Well, for investors who bought their bitcoin at low price, the movement upward of bitcoin is what they anticipate because thats how we can earn with our investment.

Just like the what other user's said here, you dont need to buy a whole bitcoin, you can buy with fraction. So before the price increase further its better to buy already. Plus even you're a poor (but you really want to invest on btc) you can find way to invest by working hard to get a pay check and invest some portion of it in bitcoin.