I have no idea but I have been mining at Nicehash using Minera with very decent results. I believe the trick is to find the appropriate difficulty. Right now, I have one Blade (80 chips) pointed at Nicehash with diff=1024.
I'm getting a fairly stable hash rate with very few rejections.
Not really sure if it does make sense lately to set diff on nicehash, because they implemented vardiff which ignores settings. I could be wrong though.
Before vardiff i think diff=2048 worked best for 5 Blades on 1 RPi. Somehow diff=8192 (from their spreadsheet) just didn't work so well.
Maybe you're right. I just shared my recent experience but I must admit my results can be pure coincidence