Thanks for all the nice replies, folks. Lots of good information coming back.
Most people have commented on the value of having tinder with you (a fire kit, if you will), and there's no question that having your own tinder makes it easier to get a fire going. But the vast majority of the time I don't cary tinder with me, and that's not likely to change.
I've got little bits of fatwood, packets of wetfire, and tubes of rubber cement stashed here and there. If it's both very cold and very wet I ensure I have something like that on me (along with wood harvesting tools, sheets of aluminum foil, etc.), but it's just not something I carry around in my pockets every day, nor is it likely to ever be. Sometimes what you have in your pockets is all you get to play with.
One of the advantages of the stormproof matches is that the hot, long-lasting ignition source will utilize "tinder" that's already with me...paracord boot laces, nylon clothing tags and straps, synthetic watch band, cordura pack material; all of which will ignite from a match, even when damp. (Good luck with a firesteel, however.)
Obviously there is better tinder out there, but the problem I keep running into is while there is no limit to what a person could bring with them, there's definitely a limit to what a person can carry. A K&M matchsafe full of stormproof matches is hardly the end-all-be-all firestarter, but it is, to me, the very best solution that's still small enough and light enough that I'll carry it everywhere, regardless of what clothes I'm wearing or what I'm doing. I can move it from my pants pocket to the mesh pocket of my lifejacket while kayaking or stick it into the sleeve of a wetsuit while canyoning and never worry about the bulk or the weight or whether the contents will be safe.
There's a very fine line between being able to do more because of what you carry with you, and being able to do less for the same reason. I strive for the former, but simply refuse to accept the later.
One of my regular fishing haunts is a nice, quick 4,000 foot descent from the car to the river in 1.5 miles. On the trip up from the river my wet waders and wading shoes add four pounds of useless water, plus I need a liter of water to make the hike. You don't have to hike that trail too many times before you get real, real particular about what you're willing to put in the pack. I don't even bring my fishing vest...just a few select items from it.
I know that tinder weighs little and it can be a real game-changer, but that's true for everything that might come in handy given the right circumstance, be it tinder or a epinephrine pen or a folding saw or a satellite phone or a handgun. There's a time and place for all of it, but when it's 55 degrees and sunny and the next storm isn't due for seven days and your heel is sore from yesterdays hike and you're looking way, way, way down into the canyon where the fish are waiting, a fire kit in in an altoids tin just isn't going to make the cut, with me anyway.
It only makes sense to prepare for situations that are LIKELY to occur given our activities. Lots of people fall to their death or drown, but only an insane person would wear a parachute outside of an aircraft or swim fins outside of the ocean.
There's a difference, often a subtle difference, between thinking you're prepared when you really aren't; actually being prepared for reasonable situations; and being one of those people who takes their survival gear for a short walk because there's no room for anything else in their thirty-pound pack. I'm not going to give up my fishing gear or my beloved binoculars or fresh apples and sharp cheese or my flask of evening scotch because I've got a pack full of emergency gear that I have no real expectation of using. That's just me.
I've looked at putting tinder in the matchsafe, but I've never found a suitable tinder. Reliability is one of the great attributes of the matchsafe...finding my matches covered in vasaline or melted wax or rubber cement isn't going to be an improvement, and between a match-size piece of fatwood and a match, I'd rather have the match. I like having more matches with me. When it's windy or wet or particularly nasty and I'm tired and still have a lot to do before bed I don't think twice about pulling out a stormproof match to get the fire lit NOW. If the matchsafe was only for emergencies I doubt I'd cary it.
Obviously there's more than one right way to do something. This is just my way...for now.