Main Question
Assuming I hold 0.001 ETH mainly for a gas fee only and the value was 0.56$ then price surge up, is the increment going to be on the Sats? E.g ( 0.002 ETH ) or the increment is going to be on the value? E.g 0.001 ETH = 1.06$?
The increment of your 0.001 ETH holding will be based on the value of the coin in USD, so if the value of ETH increases from $0.56 to $1.06, the value of your holding will also increase accordingly. It will not increase in the amount of ETH, it will remain 0.001 ETH.