I think the basic thing there is that everyone must not follow the sequence how others should be, and for any investment the investor should know the risk associated with it and be able to manage it properly. Over sometime people do not look at the risk but rather centered their efforts on the profits aspect which actually makes them not to for long time, understanding the purpose of investment always helps in securing and safeguarding their investment without being haste to sell.
About the cushion, well as I think is another way to help your investment not to be altered since it's serving as a reserved fund. And however, anyone who doesn't invest through his income or basic income where then do they get their money to invest or to keep accumulation of their bitcoin, Yes I know and it's a valuable asset that doesn't need to be altered but sincerely speaking you need something reserved fund or cushion to help you allow your investment last longer than expected as the case maybe.
Not looking at the risk but looking at the profit possibility is the number one mistake any rookie could make. You have to realize that you are not going to end up making that type of profit, there is no need for that and you should be careful with what you are doing. If you are careful about it then we are going to end up with something much better in the end as well.
However, this isn't really anything that would be profitable neither, and I believe that we need to be considering the situation that would be profitable if you are taking a bigger risk than you should. Take as little risk as you possibly could on the biggest profit you could make with that little risk. Take a look at risk first, then take a look at profit possibility.