Permission to make a lol.
If cost = low thendo cheap
If cost = high thendo expensive
I dont know the exact costs, and there are cases where its probably useful, but avoid where possible.
remembers a bookmark Stop Using the If() Node | Froyok - Fabrice Piquet
It also mentions the sign node, while Froyok mentioned it being a custom node, the Sign node has been available now without the need of custom code.