I believe, that investment should start from small amount and observe how it goes. From there, if there is good progress with your investment, perhaps you may able to add more investment and monitor it's progress from time to time. Later, you will be surprise of a better reward in the end.
In his other thread, he starts with free money that he does not use, which is a fixed budget. You can read his thread on the first page.
$200 per month as a fixed budget is good as a start to buy bitcoin and some coins and use $50 per week for his investment.
Not many of us can do that because we usually just buy at a low price and only wait for some time and if the price increase, we will sell it.
If he can constantly do the same every month, he will see his investment will grow.