It's not the amount of dollars spent, it's what they do with the dollars spent. There are plenty of good school districts in Texas that spend well below the national average per pupil. Hell, even below the state average. Likewise, there are school districts who spend far more than the average and suck.
Kids don't need brand new buildings and state-of-the-art technology to learn well. I grew up in public school in Kilgore, Texas and we didn't have all the greatest facilities and gadgets, but I was able to get a great education that prepared me well enough to avoid grammar nazi detection on KF.c.
We spend way too much time talking about how much we spend per student and far too little time talking about the other aspects of education that make it suck. Dollars spent per pupil is an easy number to derive and complain about, but the other figures are more nebulous and more difficult to nail down. If you doubled the amount spent per student in DISD you wouldn't fix the problems in that district.
Now you've drawn me offsides. Dammit. I'm going to sit out the rest of the quarter now.