Hi. My two cents. I don't use this service for two reasons and they are both related to rewards.
I used it few times in the past until I received a comment from a whale, who curates, saying that my post has been selected for curation but I won't receive their vote because I use that particular liquid service of yours.
I think 0.75% fee is fair - similar to what's now common for moving HIVE <--> SWAP.HIVE