I asked in their discord for the same thing and the explanation that they gave me is :
as hive is so low in price they have to spread their voting power, so if you boost your post with more than 1.33$ it have a lot of chance to not be upvoted, they just dont have enought voting power to give high amount voting to everyone so their advice was to keep the boost at 1$ or 1.33 ...
for me those pooints are worth, is a nice way to get at least 1$+ in my post, those are good for long term
This is the explanation I was looking for. Thanks
i'm glad it solve your doubt!
I had the same experience as toofasteddie and started to give up my love for Ecency. If this works I will be happy to support them further. Thank you for the info.