We get plagued with calls and emails from companies offering their web development and SEO services. I guess that's kinda funny given web is what we do, but when you've deleted the 10th email that day and answered the 5th call, it starts to irritate. I'm sure you're in a similar boat and you're also pretty much done with the whole cold calling brigade.
Is it possible that's how your potential clients feel about you? Are you bugging people at the wrong time, in the wrong way? Or worse, are the efforts of your marketing spend simply being ignored?