It all depends on what you're storing, I'd guess. I would love to use my attic as storage, but since I live in a townhome, I don't think that the roof joists would support the extra weight without reinforcement.
However, at my mother's house, we put in a floor and used the space to store things like Christmas decorations, older furniture (cheaper stuff), basically junk. I remember that the books I stored up there seemed to age much quicker because of the high summer temperatures, even with the attic fan working. Other than that, she didn't have too many problems.
One thing to consider: When you put a floor in the attic, you most likely compressed your insulation, reducing it's effectiveness. If you notice your utilities climbing, you might want to consider putting more insulation back into your attic. (ie, running insulation on the underside of the roof itself, using plastic sheeting to keep it in place) Keep in mind I'm not a professional...these are just things I've picked up here and there. I'd talk to an expert before sinking any serious money into the project.
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