That's understandable, most of them did not have a good volume that's why they cannot rise in price.
At this time when ICO market is still not good, you have to be flexible, buy on the exiting coin in the market that you think cheap, then wait a little and when the market is still bullish, they will have their time to rise again, that provided they have a good trading volume.
do not stick at low prices, I recommend avoiding that method. more in-depth analysis of the altcoin market you want to buy. now prices can still be very risky. lots of altcoins at low prices, but we have to look at the market history of the altcoin, if it's not feasible, then I don't think I should buy it.
Cheap and undervalued, that's my method of choosing what coin to invest.
There's a lot in the market, even cheaper but I will not see their potential based on my analysis, I would leave them out of my choices.
It requires deep study, you are correct with that, and I trust my analysis as I have proven myself capable to choose the right coin.