Home Builder's Incentives

Thanksgiving Day my husband, Chris, and I decided to drive to Houston to check out some area home builders and find out what, if any, incentives they were offering (both buyer and Realtor incentives). What we found were a few nice floor plans, a handful of knowledgeable and polite sales representatives, a handful of inept and/or unprofessional sales reps, miserly incentives, and inflated prices just about everywhere we went. Why do new homes cost so much more in the Houston area than they do in the Dallas Metroplex? And why are the builders so stingy with their buyer and Realtor incentives? And what is up with those detached and/or tandem garages?