Altcoin investment is very unpredictable. Trading in mercatox for example; I wont pointpick a name of a coin for respect also, but I wonder why the coins there that are listed just by the voting strategy defeated a coin that's been listed through paying the exchange.
It would just mean that there is more people who are willing to buy the coin through voting strategy because they have more supporters that's why they were able to win. Those kind of coins means that their support is strong and if you are one of those voters then you would want the price to go up because you made an effort for it to be listed. For the one that is paid, we don't know how much is the support of the people and many may just want to sell the coins they are holding that's why it went down.