I mean, it's not smart to invest one time big time on something that you still 100% doesn't know. Spare money is good to invest because rather than spending it on something that is not that important, invest it in Bitcoin. Holding cold cash for me isn't really a good idea, like big cash, since it doesn't make profits or anything at all, it might get steal by someone in a worst case scenario.
Spending money on that things which are not necessary and which cannot gives you profit is not a good idea because it will end up one day but if a person save money in a useful thing which can not only save money but can also makes profit of it will be a useful act.
There will be huge profit if a person invest in bitcoin but before investment some key points should be kept in mind and by utilizing knowledge everyone can obtain results that will be ever fruitful. If someone use money on useless things then it will be better if someone use that money in Bitcoin therefore money will be continuously boosting.