Welding your money is just like investing you will feel a little risk but there is 80% chance that the money will grow because by holding the money you increase the reality of that coin or in other words that coin is not available in large quantity inside the market because you hold some portion of it. That increase some amount of price(now imagine that same thing happens when many people hold money together). Let's suppose if you hold your money and somehow you hit on market crash so you just need to hold some more so that market can recover and you will still have your profit.
I think this is better explanation why the holing of coins is successful.
that coin is not available in large quantity inside the market because you hold some portion of it.
But however we need to be sure that larger audience is following the same path otherwise it would be of no use. I mean there millions of coins that are circulating for any kind of project and if you are just holding 1% of the portion then also it won't affect the market in brutal or good way if you buy or sell it or hold it. This is why bitcoin is different where at least more than 10-20% of investors, with assets in the bitcoin are holding the money as it is and thats why we see the prices of bitcoin stable now a days and they are the one pushing the things forward.
So yeah that would be good idea to make it more sustainable investment, by having the coins bought at low and hold for long time. Thats what breaks the buy wall and moves towards next one and bigger one when we see it in the market or exchanger loop.