Those who can't afford potential looses and are not comfortable with the market volatility should just stay away from bitcoin investment, for the game in bitcoin investment is not for them
People think Bitcoin is the only investment that possess risk not knowing they pass through different kinds of risk in their day to day activities. If risk would stop anyone from investing in Bitcoin, I don't think they would ever make any investment because there is no single investment that is totally risk free. Although, it might be a good reason for some but I consider it wacky excuse. What happened to notion "no risk, no gain"?.
Those seeking for short term profits should just stay way from bitcoin investment, for Bitcoin investment doesn't give short term profits, where those category of people belong is cryptocurrency trading and not bitcoin investment.
Don't necessarily need to stay away from bitcoin, but they are traders and not investors. Unfortunately, they chose to forfeit their long term gains for short term meagre profit and probably lose them in the long run.
Those who are lacking emergency funds, living in paycheck to paycheck, and struggling with depts should just avoid bitcoin investment or they we end up investing nothing but regret, because they can never accumulate a good portion of bitcoin to hold for long term, or they we end up selling their bitcoin investment at early stage, because of emergencies that may arise along the line.
This should be the most valid reason here because shortage of funds really destabilize one's investment plan. However, the truth is no one is being paid emergency funds from their place of work, you are responsible to make provisions for that. No matter how little you earn, if you plan your expenditure properly you'll definitely thrive by implementing an effective financial strategy.
Knowledge and understanding are also essential in bitcoin investment, so those who lack knowledge and understand about bitcoin investment should just avoid it, because if they invest in bitcoin with ignorance sorry is their name.
No one is born knowledgeable or ignorant. You feed your brain with appropriate knowledge and if you really have interest in bitcoin, you will seek the knowledge by all means. It's one choice to lack or gain the knowledge on specific area they choose.