Someone ask me a question after introducing bitcoin to him, if he can start up with $30 and grow with it but I told him bitcoin is wide and high in volume, price and market, that's means whatever you're starting with determine the outcome of the market like for example; if you start with $30 and eventually the market goes up to a little increase of $32 can not be compared with someone who started same time with you, at the rate $100.
The cryptocurrency market has been bullish and bearish for a long time. Suppose you invested only $30 in a bearish market of $20,000 price and when the market reaches $40,000, you will make $30 and the person who invested $100 will make $100. How much will you profit if the market starts a bullish movement and rises to an all-time high like $100k per btc? If the market reach $100k you will profit $120 if you invest $30 and what will you do by this amount? Invest strongly in something where you can get good returns even after a long period of time. After waiting for a long time, if the money is not received as expected, it can lead to resentment towards the investment. In my perspective invest $30 in many cases not suitable for investment.