It is better to buy not cheap, but reliable crypto, which grows quickly, and falls slowly. Only in this way there is a chance to get a plus.
No doubt bitcoin is highly priced but it is also high valuable and highly profitable than any other crypto in the world. You can buy cheap cryptos but for making money you will to wait for long time because the price will not increase fastly and may devalued in the future. if you want to invest in low price coin then you should invest in ripple. It is best in Altcoin.