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.
So also when the market is down to some extent, the person with $30 may likely loss more because of the money is small. Blockchain has the minimum amount one can invest if am not mistaken but if your amount is too small may be difficult to make easy progress.
What do you think about my advised to him?
You are right the high risk investment can get a big profit while if you only invest 30$ that is not high risk because it is not big money so in small capital we also earn small profit, it is really hard to choose because if we invest big amount and we will loss we will have a big regrets but if we earn small because of small capital we will also regrets for not investing big amount it maybe depends on luck.