Just in case you don't know, it can actually be more profitable to vote early on a post that ends up with a lot of rewards than voting on your own comments. One reason is that your rewards increase the more other voters vote on top and at the same time there is a tax curve up to ~20 hive post rewards which gradually becomes bigger the lower the rewards are (afaik).

I know some people vote up comments for visibility but this one seems to just be about the rewards since it's a reply so if that's what you're focused on then curating might give you higher ROI.