There is a bit of skill to getting forks to come out well, but I think its worth it. A custom made fork is the key to making a high quality frameset. Why? A few main reasons: unlike production bikes (they work around one or two sizes), I can tailor the fit and geometry to perfectly match the frame.
Steel forks have a ride quality that is unparalleled. This is due to the fact that steel has such an incredible elastic limit, so that the blades can be designed to be as supple or firm as desired, without concern over permanent damage on potholes. The fork tubes can be switched out depending on the intended loads or use.
Custom forks are very adaptable. Bikes that have fenders or larger tires (or want the option, even) can be built with a bit more clearance. Any sort of attachment point can be added as well: disc brake mounts, rack mounts, mounts for lighting, etc.
Steel forks fail in the safest way possible. Steel is a ductile material, meaning that it will bend a LONG way before it snaps. Should the fork sustain some sort of damage (anything can be broken), a steel fork will give the rider the best possible chance of staying upright. Low ductility materials can fail very quickly as cracks (perhaps from an earlier event) rapidly propagate through the remaining section. This type of failure is particularly horrific in both wheels and forks (face, meet ground!).
To be fair, steel forks are a bit heavier than an equivalent carbon fiber fork. All things considered though...unless you are competing in an elite level event with a large elevation change this difference is insignificant to performance. Don't believe me? You may want to note that most U.S. road time trial records were set on custom steel frames with steel forks.
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