This got me pretty stirred up. I’m excited that SnapRetail put out a rule of thumb, because it’s a great contribution for people who are starting to do content marketing and have no guide. But I think the proportions are all wrong (it seems to be all opinion, rather than based on any case studies or data). So here are my amendments.
First off, until you’re creating content, you won’t know how much time it takes to create good content. Trust me- content creation takes a lot of time. Or you have to spend to get someone to help you get it created. There’s no way, unless you’re putting out very little content, that you’re going to create 3.5x times as much content as you curate. Just think of all those people who retweet Mashable all the time- are they creating 3.5x as many blog posts? Nope. Let’s get real 
Second, 10% promotion, if you’re in retail or ecommerce, probably won’t get it done. And if you think it does, I’d love to see your analytics. Seriously- we’ll publish that and get it out there and get you some press. Just contact me.
And to find more hot content to curate, search for your brand here and check out affinity content (the hot content from other pages that your fans are interacting with).
Or try an industry page to see all the hot content in that niche: