Selling during profit is not a bad decision. If one holds it for longer period for higher profit then it may bring bigger things even if it is ricks for him. But currently the market condition looks a bit better so I don't think it will be a bad decision to hold now. But everyone should decide based on his personal forecast and personal research whether he should hold long time or sell at profit.
A tiny income is still income. You don't have to make a lot of money before you may withdraw. When it comes to investing, you need be cautious, especially if you are investing a large sum of money. However, we can't always avoid to think that the money we earn is very little because we believe the price will skyrocket over this period of time. That is why we cannot blame them for the losses. So, as long as there is a profit, small or large, selling it is a wise move. Exactly what you said.