As far as saying “I have an advantage today (or on a given game) so I’m going to play more” like you can with wagering? I don’t think that concept exists in DFS. There are too many variables that any reasonable assumptions about ownership, scores etc quickly get out of hand.
However, I’ve found success with consistency 1) using my projections consistently. 2) playing consistent contests 3) playing for consistent dollar amounts per day/slate. It’s more taking the long view approach.
I’m more of a NHL/MLB guy so there are lots more contests to play than NFL.