I don't think it's worth it by itself. I bought some diggs on an article and then realized my article was still burried. There were actually articles with 1,000+ diggs on them that were burried. All you have to do is search through your category (business, etc.) and go through the pages and see how articles with more diggs than yours will be burried, so yours will be too. You still need comments and I believe the key to getting up higher in digg is likely to get someone who has lots of followers to digg it first. If you ever find someone who can do that, please PM me, I've been looking for someone with lots of followers (5k+) who'd dig my articles and I'll then get someone else to add diggs to it. Otherwise I think it's worthless.