The FBG Survivor Leagues don't subtract for turnovers. As with anything, there are advantages and disadvantages to it.
On the plus side, it's nice to know that once a player (except for DSTs) has put up points that they're "in the bank" (especially in a survivor format, where your only real goals each week are immunity or avoiding elimination).
The minus is that it makes the concept of league "value" further divorced from NFL value, especially for QBs. Personally that doesn't really bother me much - you just need to know going in that a gunslinger like Cutler has more value than a protection artist like Big Ben relative to other leagues and draft accordingly. For others, it's a bigger deal. Different strokes.
In general, I like unorthodox leagues. I feel that the more the roster requirements / scoring rules diverge from the usual standards, the greater my opportunities to identify sources of hidden value, and the bigger my advantage over my fellow owners.