I try and do my part by voting up the answers that are truly useful when I come across a question by searching, but I agree that it does tend to be a first-come

I try and do my part by voting up the answers that are truly useful when I come across a question by searching, but I agree that it does tend to be a first-come first-serve type of system for the most part. They've taken some steps to alleviate that (badges for getting an older answer upvoted to +5), but it's still an issue.