You can start your bitcoin investment with whatever amount you have. It doesn't have to be a huge amount before you can start your investment. So there is hope for every investors. Bitcoin made it possible for all classes of people financially, to invest in it. If it were just meant for people with big money to invest, bitcoin wouldn't have been a perfect invention. Start with the one you have, and you can gradually be adding it as more resources keeping flowing in. Bitcoin is usually not just a one time buy, if you invest little cash today, and tomorrow  another little cash comes in, you can invest again.