The break even point they mentioned in the post is 20 STEEM not 20 SBD. That's more like $3.60 at current prices. Even somewhat below that, the effect is pretty modest. People are freaking out thinking they'll get completely screwed out of rewards if the post value is below 20 STEEM but mostly that isn't true. At 15 or 10 STEEM you may not even notice the difference given regular daily price change on STEEM of +/- 5-10% as well as other factors.