Marketcap is the most important factor when determining if a coin can go 10 to 100x. Not because the coin necessarily is a good store of value, but because the current market has shown what level of market cap it is willing to tolerate. We are still in the wild west days of the cryptocoin market. There is unfortunately less importance put on future promise than immediate returns. Just look at the number of coins that are fake at face value (looking at you picklericks) and tell me that low marketcap is not the primary means of determining "moons".

tl:dr - Low marketcap is directly linked to the probability of huge gains, but hopefully that won't always be the case.