The irony here is that many of the most expensive homes in our country have bad Feng Shui. Traditionally, we've built homes here in the USA with little or no regard to other cultural concerns. Only recently has there been an increase in Feng Shui principles. The actual percentage of homes designed and built with Feng Shui in mind is miniscule in light of the overall market.
It appears to have made no impact on the market over the past 18 months: there have been multiple offers on houses at T-intersections, with stairs aimed directly at the front door, with front doors facing due west or due north, with neighbor's windows facing directly into yours, with swimming pools, overhead power lines, backing to busy streets, train tracks or cemeteries, the exterior painted purple, a recent death in the home and so on.
In reality, the majority of those currently buying in San Ramon are more concerned with school scores than bad Feng Shui. Overall condition of the home is also more of an issue.