Well, from a newbie standpoint, I agree that these birds would be great in an urban setting. I know people keep racing pigeons in major cities, and the Texan Pioneers are more mellow than homing pigeons. Also, they don't show any desire to fly away, as I found out when one got away from me when I was taking them out of their shipping container.
Grain is indeed expensive, but these birds REALLY don't eat much, at least when they're not raising squabs. I know Joe mentioned this earlier, but I'm still surprised to see it first hand. I would estimate a pair of 2 lb pigeons eat about as much as a 14 oz coturnix quail. I bought a bag of mixed pigeon grains, which range from small millet to large peas. My birds have been leaving some of the millet at the bottom of the feed cup, but I just give it to my chickens with their scratch grains. With only six pigeons I'm not worried about the feed costs, but as the flock expands I'll give it more attention.
I also raise meat rabbits, and in fact I'm using rabbit cages for temporary pigeon housing until I can build a proper loft for them. Each pair is in a Bass Equipment 48" x 30" x 18" cage (10 sq ft) set on cinder blocks and covered with opened-up feed bags on the top and sides. (Partially visible in the photo above.) They face the southwest so they get a good dose of Arizona sunshine most days. I'm working on a common area made of chicken wire on a PVC pipe frame, but I want the birds to get used to their new home and hopefully pair up before I let them out of their cages. The pigeon droppings "almost" make it through the cage floor as cleanly as rabbit droppings, but I'm expecting to have to scrub pigeon cages more often than rabbit cages.
Side note: I wouldn't consider raising pigeons (or other poultry, for that matter) as a way to save money on food. Raising rabbits and poultry at home is more expensive than factory-farmed supermarket meat, but it's worth it to me. I'm a decent cook, and enjoy preparing restaurant-quality meals for my family and friends. Squab will be a welcome addition to the menu!