also - unless you are selling the coins the moment you are mining them - following which coin is profitable at that exact moment means nothing. Do some research, mine the coins that will gain value or will at least hold their value - sell when they are up, hodl when they are down.
It means alot. I will give you example:
Lets have 2 coins:
Coin A that gives me $1/day if I mine it at the moment (and can go up or down in price)
Coin B that gives you $0.50/day if you mine it at the moment (and we both know will double it price in near future, since we both did the research)
I'm selling my coins A to buy coins B at the moment I'm mining them. We both hold coin B.
I will always have twice more coins B then you.*
*Lets asume that transfer and exchange taxes are equal to zero.