MrJayVee said:
...Virtually nobody is going to buy a mere idea.
Although I agree with you 100 percent on everything all of you have posted regarding this matter, I do have to point out the extremely few and rare exceptions.
Andrew Marlowe, a screenwriter, who had sold only one screenplay to date and did one or two episodes of some defunct TV show, was at a hotel in LA and noticed Arnold Schwarzenegger sitting poolside. He went over, intro'd himself and proceeded in pitching him an "idea" he had literally though up as he was walking over to Arnold. "Think of it. Schwarzenegger fights Satan." Arnold loved the idea and it was bought just on that alone. Andrew wrote the script after that. It was called "End of Days."
My point being that specs are but one way to get work. More than 60% of all screenplays sold are either from pitches, synopsis, treatments, or found/bought material (ie. books, plays, tv, etc...) Most writers I know (including myself) work on assignment with rewrites, story consultations, drafts on preexisting material owned by a producer. The spec script is not the staple in a writer's diet. We do however come up with ideas, outlines, treatments and such all the time. If we start getting interest in one story, then write it out fully.
At this time, I write about 2 completed specs a year and about a dozen treatments, outlines, etc... This way, I have a few to show but a lot to pitch. If one producer loves one pitch, then I can send him the synopsis/treatment. During the time spent waiting, I get a first draft finished (takes about a 5-6 weeks to mail, wait, and hear back. Plenty of time for a first draft.
Don't limit yourself to spending an entire year writing one script and hoping those eggs that are in that one basket don't break.