Many people are carried away by the motives of getting rich quick irrespective of the risk involvement, any one selling btc for altcoins is a trader rather than an investor and can not be seen as a hodler because Bitcoin holds much of a long term goal, well the choice of where we put our money is solely depends on our individual risk assessment and conviction. But you should never invest more than what you can afford to lose. that is the golden rule.
Certainly, greed it is inherent aspect of human nature, frequently compelling us to seek rapid wealth through participation in investment schemes promising overnight fortune changes. Some of cheap altcoins are similar to those schemes but not all of them. It is therefore advisable to take cautious approach while investing in altcoins. Bitcoin is certainly a preferred choice for investment and holding it for long term, due to its historical record of performance, decentralization and limited supply.