I'd say my personal stance on the Topre based boards is that in order to justify the price, there has to be something else about the board that really, really appeals to you besides just the key feel, otherwise I think you will be at risk for the "meh" reaction after your purchase.
For instance, if you love the way the HHKB looks, the size, the layout, portability, detachable cord, don't mind lack of arrow keys, have a Unix beard, etc, then it probably makes sense to pull the trigger and just get one.
If you really like the black on black keys, are annoyed by cost-cutting build quality like uneven seams and squeaks and rattles, think the capacitive technology is neat, and want to support economies where workers are treated fairly and care a little bit more about the products they build (as Majestouch has pointed out before), then a Realforce might be a good choice.
That said, when people come sit at my desk to log on to my PC and help troubleshoot, log in to time-tracking software, etc, I have never had anyone make any comments about my Realforce like "Wow, this is a really nice keyboard!" or "What kind of keys are these? They feel different somehow." The average non-keyboard-enthusiast really can't tell the difference between a Topre and a decent rubber dome in my non-scientific-totally-random samplings so far.
Whenever I have one of my Cherry Blue boards in service, though, people always notice it right away. Not everyone likes it, to be sure, but people always point out how it feels different than what they're used to. Interestingly, many people think it feels really "light" or "sensitive", even though the Topre is technically much lighter. I assume that's because on the Topre it doesn't make much difference if you bottom out or not, but the tactile feedback on Cherry switches lets you know you don't need to bottom out.