I blew SBDs once by sending them to @bellyrub after his voting policy was changed so I missed a 0.6% which I deserved from it.
The other time was today, when I sent 1.41SBDs to @promote my post
https://steemit.com/steemit/@stimialiti/to-dan-ned-the-witnesses-and-to-everyone-invested-in-this-platform-to-save-steemit-this-is-what-you-should-do
And got a 0.41$ worth upvote which even went down further in value due to STEEM and SBD going down the gutter.
Better pay @randowhale and @booster than to @promote, and the worst thing is that my post never even appeared in promoted, nor in steemit, which is its main tag.