I can offer some insight, being a noob on verge of getting his first humble and hopefully real Nihonto after dreaming about owning one since I was a kid (I'm 36 now).
Funny, but I had just assumed I was hopelessly priced out of the market (maybe because of the insane prices original Japanese blades were fetching back during Japan's economic boom) so I just assumed the closest I could get to an actual feudal era Japanese sword would be from the other side of museum glass. Still, if only I could of saved the money I've spent on "high end" reproductions over the years without even considering a real one, I would of had plenty to buy a respectable real katana or two from a reputable dealer.
Still worried I bought crap though as my new sword WAS on ebay, despite being offered by what seems to be a reputable dealer in America, being in pretty rough shape from a middle-ground maker in a relatively common era for collecting, not too risky a price and having all the details match up with my eye for antiques + severely limited but growing knowledge on the subject. Maybe I'll entertain/torture y'all with a "has I done good... has I?" thread when I get the sword in a couple days.
Another issue is the maddenly arcance (yet still new and fascinating to me) world of Nihonto itself. Many newbies just dipping their toes in the water probably get scared away by the sheer complication of it, not to mention the somewhat frigid reception from the "learned ones" already doing the backstroke way out in the middle of the lake. If you want your hobby to survive, you've gotta be willing to be a teacher and someone who is capable of inspiring respect and even awe for the hobby subject in newcommers, not an elitist who spends their hobby time laughing at and smacking around those who know less than you. After all, the old addage "you can't take it with you" should be abundantly clear with regard to collecting swords that are centuries old and may even be nearing their first millenium of existence... and if you want them to make it even longer, you've gotta pass the love and admiration for them along too!
Conversely, newbies should recognize this is a complicated and technical pursuit that takes a great deal of effort to grasp, be willing to learn (and especially) be taught, and NOT just be like "Wow! look what I bought online or found in my Grandpa's closet... how awesomely wealthy am I gonna be now!?" after hacking down a couple saplings out back with it.
I can already see Nihonto is not about money... it's about the reverence for and (possibly irrational) love of the art of Japanese swords and the spirit of those who made/used them... not to mention a great way to make one's bank account balances disappear (like all good hobbies should!) rather than getting rich by finding a lost masamune blade at a garage sale or even more likely through a Chinese ebay seller! ...which brings me to my last observation!
Reproductions and fakes clearly vastly outnumber the real thing and create a virtual minefield of crap and outright thievery in this hobby that everyone who wants to play has to go up against... something I never even have to worry about in my other hobbies. In the immortal words of some random urban American lady: "Ain't nobody got time 'fo that!" I know getting burned would slow my ambitions a lot, and just the fear of it takes away a goodly portion of the pleasure from the experience.
In the end, is it any wonder quality Nihonto recruitment is "a wee bit slow"?