Honestly it all depends on how the EdgeRank algorithm see’s your Facebook page and the content. I manage multiple Facebook pages with different amounts of likes, and I can tell you that EdgeRank treats each one differently based on how those pages have been managed over time.
If you are sharing a link to a piece of content, the most important engagement factor is click-throughs to the link. Because I know my audience and I’ve been creating content that I know they will click-through on my organic reach is at least 50% of the people that like my Facebook page.
Other factors obviously come into play (likes, shares, comments), but I get 20% click-throughs on most of the content I share on my page, because I’ve been working for years to build my organic audience, since day one. I’ve never asked anyone other than people who visit my site to like my Facebook Fan page, they are after all the people who would engage with my content on Facebook.
Consistency also plays a role, but I’ve never had to spend money to reach the people who already like my page. I don’t reach all of them organically, but 50% reach without spending money seriously pays when I do decide to spend money. On average I can reach 40k people with as little as $5 spent. This reason I can do so much with such a little spend, is because the EdgeRank algorithm ranks my page and content as high quality, based on the consistent engagement.
The fact that I never asked for likes from people who would not engage with my content, directly comes into play here. It takes time and work, but just like SEO, if done right from the start it makes your life way easier down the line, no matter how big your page gets. And I’m not just saying these things, I have the stats to back it up.