Parroting KyNola (and inserting another couple of cents worth - a good argument for discontinuing use of the penny), I think the fresh spice/herb thing is excellent, especially if you're making soups, stews, gumbo, etc. (wet dishes?) or mixing the flavor into something. Nothing says you can't roast/dry/smoke or just add your own peppers for paprika or cayenne flavoring or chop up your own onions, garlic, thyme, etc.
However, as KyNola also pointed out, it might be a bit problematic if you're looking for a powdered application (like in blackening) - not sure I'd know how (or want) to dry and grind onions & garlic.