I think this makes sense in the stockmarket which is much more established than cryptocurrencies which are not. The stockmarket is unlikely to ever fall to 0 an

I think this makes sense in the stockmarket which is much more established than cryptocurrencies which are not. The stockmarket is unlikely to ever fall to 0 and if it does then there are much bigger issues going on that you don't need to worry about it. But bitcoin or ethereum could well plummet to single digits and you could lose your entire investment. This guy invested a lump sum and if he isnt happy to lose it all he should withdraw what he can and cut his losses. If he didnt take a loan out, or used cash that was otherwise going to be use for investing it may be adviseable to hold onto it for 12-24 months and check back then.