By delegating to @ecency I get 100 Ecency points a day, plus their curation rewards. As a witness I see huge value on those points because on the app I can use them to promote my posts!
More visibility can mean increase in the possibility to get more votes and grow as a witness. So I am investing those points to promote the posts with my witness campaign snippet.
The curation rewards are cool too, and seem to be an above 10% yearly yield, but as a witness the promotion is what I am looking forward!
Hope this strategy works and I eventually make it to the top 50, it may take a long time, but since I prepaid my server to host my witness node for the next 1 year, I have patience.