It's one of those marketing sayings that has many interpetations, sort of like how the 80/20 rule has become the rule for everything in life. That doesn't make it less true. 

I recently wrote two posts that discuss how to get buyers or sellers. Someone asked which idea works best. I say, "Let 100 flowers bloom". Plant 100 seeds and collect data. Analyze it. For example, if you put an ad in the paper, how many responses do you get and how many of those that respond turn into clients. If you purchase an ad here on AR, how many people click on your link vs how many actually turn into clients. Know where you are growing flowers and where you are growing weeds.

There's another rule in marketing that basically says double what works and stop doing what doesn't. Don't work the area where weeds are growing. Spend your marketing dollars and efforts where the flowers are blooming.