You will be hard pressed to find a runner withou 3x Sure Gamble in it. It is the stable of burst econ. Giving a net of 4 credits.
Notable interaction with Mystic Maemi and Patchwork.
Mystic Maemi will allow you to play Sure Gamble and use the creds on Mystic Maemi. Basically, it will give the runner all the creds on Mystic Maemi, giving a net gain of 5 to 7 creds.
With Patchwork, trashing card will let you gain an extra 2 creds when using Sure Gamble, for a net 6 creds.
The only other burst econ card that compare in ease of use is Easy Mark, which gain you a net of 3 creds. Any other burst econ card have extra conditions attached (successful run, run on an ice, give token, take a tag, etc.).
Since Sure Gamble is neutral, you will always see it in a runner deck. Burst econ goes a long way, and 4 creds is good burst econ. While you can make a deck without it, for example, if you make a ressource heavy deck using Oracle May, it will be slightly slower than other deck because of the lack of burst econ.
Finally, let's face it, Sure Gamble could be the face of the runner side of Netrunner. The quote, the lore, the flavor, the art, the cards... This is Netrunner.