The price of the coin doesn't matter whether it is under or over one dollar as you should also consider the supply of the coin and the marketcap right now, for example ripple is under one dollar but the marketcap is one of the biggest one in crypto thus it need a lot of money to move the price. Lower marketcap project can bring you more profit but they are riskier aswell.
I do not think so, the price of coin is always very important, it is the best evidence for growth and what could happen in the future of coin, the value is too low, it just says that the coin is not respected, even just a project for others to use the pump and dump. The future can not develop steadily, always under the control of others, while if the value is high and grows over time, it will help us know that the project is potential and that the development team in the back, they always help it go up every day, the investment is worth more than the altcoin under 1 dollar