You're right, profitability can change very often. But the whattomine still does not have many of the coins that gave the best profit a few days ago. Therefore, it is better to have several sources of information.
Thats true and whattomine was just an example for it , for sure there a few more Websites where can get your Information about your coins you want or looking for.
Back in the days it was even harder as it is today as there was no sites where you could looking about the best profit you should be mining.
Its maybe my mind that tells me looking for yourself what you mining as just go for it based on others.
Anyway i wish the OP good look with his Bot.