a man by the name of rheland rides one regularly in new york. he's 6'5'' and very broad and big, weighs over 320 pounds.
the bike looks normal size because of his size, but then when he rides near something on the street that provides scale, like a fire hydrant, it's very amusing.

At 6'5", I wonder how big is too big (or little)?
For the money talked about here, I would expect some suspension and shock absorption.

So not only do the tall and big people get singled out for these special order bikes; like all other items including shoes, clothes, etc., but you also have to be incredibly wealthy to afford one of these bikes.

I don't see why a big bike absolutely needs oversize wheels. "Normal" people ride bikes with small wheels and as long as the frame is properly designed, say they can't feel the difference. Owners of Moultons and Bike Fridays would attest to that.

I'm with Timelord. With regular wheels, you get a far better selection of tires, and you can put them as far apart as you want. Larger wheels are better on potholes and potentially easier rolling, but otherwise irrelevant to handling. This is just another expensive gimmick based on confused thinking, selling looks rather than transportation.

I'm 6' 10" tall and I wish this would have been available when I was young enough to enjoy it...
I do agree somewhat with the fact that tall people can ride bikes with normal size tires and such without too much trouble, but if you like to do some off-road riding then a larger size bike would be beneficial. I did some trail riding in my younger days on a normal sized bike that had a long seat post, but when going up or down steep grades, the geometry of that setup gave me a very uncomfortable feeling. I would really have liked to have a setup with a longer wheelbase and larger diameter tires to give me a bit better stability.
Too bad I'm too old to really enjoy a rig like this. Get off my lawn! ;-)

Question is, where and How much are the tires/tubes.....I like tall tires/wheels but worry about where to find new rubber when needed?????.......LOL :-)

A larger composite frame is needed, as power-to-mass doesn't scale linearly. The bigger and taller rider needs a proportiately lighter bike. Also, I am 6' 4" and ride a 24 in. Schwinn Voyager, which seems big enough. I made 3 fiberglass bikes around my dimensions in the 70's, gradually reducing the mass. Now, I am trying to come up with lugs for off-the-shelf composite tubing.

I've had a Coker Monster Cruiser for years. They have 36" wheels and cost only $700 dollars. It sure is an attention getter. It's fun to get on and off since I'm only 5'8". http://www.cokercycles.com/coker-monster-cruiser/

The price is a stunner. Walmart had a 32" wheel bike a few years ago, but they're gone now. Plenty of 29" wheel bikes out there, and many are quite suitable for guys up to 6'6" and maybe taller. Here's a good one for about $320: Mongoose Impasse ... http://www.mongoose.com/usa/bikes/mtb/xc/impasse-hd