That's ironic, too!
Check out THIS THREAD
I JUST (this morning) sold a BRAND NEW (one week old, used just ONCE) D70 kit with a spare battery and a Compact Flash card for $1200.
I bought it rather than renting a D30/D60 or the like, knowing I'd be able to sell it for close to what I paid. (We needed a third camera to handle three simultaneous events).
I liked the D70 just fine; it's nice and lightweight, and produces images with good color and excellent clarity/sharpness (even with the consumer-grade 18-70 kit lens). I found the interface a little "Mickey Mouse" for my tastes; the menus were big and colorful, and a little less "professional" than I'm used to, but the functionality was all good. It's just that I'm a Canon guy, and the D70 just isn't capable of shooting fast action events, which is what my biz specializes in.
[and for NH's benefit:]
...for that matter, the 10D isn't too good at it (shooting fast action events) either. I used to tell myself that the 10D was just fine; that it was capable of shooting action (like motorcycles on a racetrack) with acceptable results. The fact that people were buying my images seemed to prove my point. However, I took the word of many professionals who shoot with 1D's, and who told me that I was missing the boat (and sorely mistaken for thinking the 10D was good enough for what I was shooting). I got my 1D last fall, and now I'm awaiting a MkII. Believe me when I tell you that it hurts my eyes to look at trackday shots I did with a 10D last summer...the focus just can't keep up for anything other than side-panning shots, and even then it's hit-and-miss.
The 1D's 8fps and half-as-long shutter lag makes it much more responsive as well, and the AA (anti-aliasing) filter on the 1D is much weaker, resulting in much sharper images right out of the box.
I guess it comes down to expectations. If you and your customers haven't ever experienced images other than those from a 10D/D70, etc, then the shots will likely be good enough. But as for you - I'd suggest you avoid trying a 1D, or risk being irreversibly hooked!
Finally, don't get me wrong...I shot action events for a full year with a D60 and then a 10D, producing acceptable results, and making some decent money. But in retrospect, I should have ponied up back in '02 for the pro body. I now know how much better my shots would have been, but I'll never know how much more money I could have made.