I normally get nearly zero recruiter emails, but late last year I changed my location preferences on Indeed and/or Career builder (I don't remember) from my hometown to Washington DC and suddenly I was deluged with the 20+ recruiter emails per month; more right after I update something on my profile.
Strangely, 1/2 of the emails are for locations far away from DC. I might try changing my preferences to San Jose and see how many more I get.
My "profile" is pretty much just my resume. Experience seems to be another important factor.
80% of it is for jobs within the surrounding city, 10% for within the state and 10% out of state. That said, most of these jobs you could also find without the recruiters as well, but sometimes ones from internal recruiters (and if you're lucky a developer/dev manager) are useful.
Admittedly, I'm not in the market for a developer position, and I deliberately down-play my development experience in my profile, which probably reduces my contact count substantially. I should conduct an experiment wherein I stuff my resume and LinkedIn profile with programming languages and framework keywords for a month and record whether it has an effect on recruitment volume. I suspect it would.
Just follow all the guidelines that LinkedIn gives you, so that your profile is an "all-star" and make sure you have a bunch of connections (500+).
An email a day is fairly normal at least for SF engineers.