My success rate on taking a titanium spork (as sold in camping shops) through airport security is that I lose one about 0.5% of the time - I lose one every 12-18 months and I make 100-200 trips through airport securities in various places in that time. Occasionally some busybody bothers to dig it out of the bottom of the bag and glares at me.
The main point of contention seems to be how sharp the tines are, I have had more success (as in, examined a couple of times and not seized) with one that has somewhat rounded points and not really sharp ones.
So I carry one in my hand bag for the inevitable times when my airport or airline meal is missing cutlery through my own or others' fault, and one in my hold bag as a spare so that if it gets taken off me, I just switch to the spare. Running costs of this arrangement are GBP5/year ish
(I have a titanium one because it seemed cool, but I mention it because it's non-ferrous and that might make a security difference).