Let's be honest about buying bitcoins, many of us would love to do that but we are just not in financial position for that. It's good to have couple bitcoins in wallet for future, who knows how far can bitcoin get, that is the best reason to buy and have bitcoins.
Yes the only reason we couldn't buy large amount of bitcoin is only because we are short off money and current price is too high to make an investment in it so try to invest in small parts as whatever amount you collect will surely benefit you in future.