First off, you can yield as much bud as you can fit root mass. You can yield 2 ounces off one plant in an AG if you veg it long enough and have enough light.
Just because you have a 10 gallon res doesn't mean your plants are going to be massive. Thats just more of a pain in the ass to adjust ph and add nutrients to the water because everything is on a bigger scale. Not to mention how much of a bitch it is to move it around.
The res can hold 1 gallon of water (its about 2 gallons but thats past the fill to here marker and the opening in the res) thats more than enough room plus you use less nutrients, more water = more nutes = same concentration. So you save money this way too.
AG is fine with 1 or 2 plants, plus he already has a drip feed system set up, no need to ditch it for something thats exactly the same.
Slickrick has cfls along with the UFO, I think hes got a great setup, the only thing I would suggest would be organizing the grow space a little bit and get some more 'finite' lighting fixtures, while the dangle with duck tape works, its not really the best solution.
Just because you returned your AG doesn't mean you have to hate on people that are still using theirs, theres nothing wrong with growing in an AG...