whattomine is a snapshot of current difficulty and price of the coin - during the day all move up and down, so the results move with them
you should focus long term or keep changing the miner every hour or so
24-48 hours is it the long term enough?
Yesterday WTM showed from 9 to 12$ (and today is 7.4$) for Vertcoin and Mona per 1080ti. I was not able to get close even to the half of this value on different pools with different miners on lyra2v2 (btw, despite of different miners the result near the same +/-5%). My profit was only 1-3$ per card.
IMHO, they shows absolutely wrong profit for some reasons. I only hope they was not hacked or get paid for this shit.
WTM shows only for avg difficulty not real-time difficulty. does not reflect in reality. you will earn less or earn more