Hi! I guess it's difficult to make some tests myself because I only use vote-selling above 80%. It's my way of avoiding wasting VP if it gets too high. If some day I go on vacations, there maybe I can try to see exactly how much profit I can make through vote-selling.
But through smartsteem website there is a revenue calculator, and there you can see vote-selling is just slightly less profitable than delegation. With the advantage you can stop vote-selling whenever you want... And they also have a whitelist so you won't be upvoting crap, supposedly
Thank @zpedro. This is really useful information. I truly appreciate it. all the best to you.