It's an investment for the future so it shouldn't be used as a main hustle cause if so the investor would be needs to take profits when it's not the right time, which is against the idea of Bitcoin Investment. An investor would need to use some percentage of their income on a specific interval that's suitable to them, be it weekly or monthly to buy and hodl Bitcoin fir long-term and still have some reserve funds for other activities instead of using all their income for Bitcoin investment. Anyways, concerning your second statement, I put it to you that volatility is not a issue if you use the DCA method of Bitcoin investment, you don't need to be worried about the price dropping or not since the DCA is very effective when it comes to recovering lose and maximising profits. Bitcoin is not a stable coin, therefore the price can never be stable, volatility would always occur and that's where the DCA plays a good role.Bitcoin is less riskier and more preferable to other Cryptocurrencies.