Financing DVC should be viewed through the lens of other consumer debt. The average car loan (according to Google) is now close to six years. So, a 10-year DVC loan isn't absurdly out of whack for a resort-dependent product you can use for over 40 to 50 years.
If we want to keep the comparison within the vacation and leisure realm, financing an RV (there are a gazillion of them around) typically lasts between 10 and 15 years, and your DVC ownership lasts far longer.
I'm willing to bet that financing DVC ownership is far more common, even on these boards, than many will admit to. Is it a good idea for everyone? Probably not, but comparatively, it's not the worst thing in the world, either.