I also checked that on there site and thats true oO Pool Sexy shows more estimate than they give the users!
More is okay, but nut +15-20%... thats never real and looks like to hold the user cause on the frontpage looks like they make really much, but they made much more lower profit
I didn't see any problem with sexy, I have 7 rigs pointed out in pool.sexy but it's all fine, the estimation of income are not always accurate even in coinwarz and whattomine they can only give a figure.