Obviously, CBB is not the only factor that will determine whether a property sells fast. If I want to sell my house before market prices deteriorate even more, I’d make sure that each of the following is competitive (in no particular order):

– CBB among the highest in the neighborhood (not just in line with the rest).
– Price that is realistic given the market conditions today.
– Aggressive marketing by my agent.
– Proper staging and attention to curb appeal.
– etc.

I’m not surprised that you found no correlation between CBB and whether a house sold fast or not. For that, you would need to control for all the other variables. A house priced right will sell no matter how low the CBB is. Similarly, an undesirable house with freeway noise or poor maintenance will be slow to sell, no matter how low the price or high the CBB. CBB matters, but is not the only factor of interest.

If you are a seller you need to make sure your CBB is not average or below average, but you also need to pay attention to price and other aspects which are equally important.