When it dips down this low, that is the time to buy in for more.
Also too, when it gets down this low since you can buy more(it was at 78 cents per), you can essentially buy double the steem. Then when price goes up and you have lets say 2,000 steempower instead of 1,000(since price went in half), then your 2,000 steempower is worth more in voting.
Check out your current steempower vote here if you want to see what I mean, it calculates it for you depending on the steem price.