Is This a Secret Code – I Don’t Get It

I get a lot of strange email, most of which is what you would call SPAM, yet I don't understand why I get it.
Why is someone spending the time and money to send me literally hundreds of these per week, no links, no discernible purpose.
Here are some examples:
1) (arabic string replaced)
What is that and what does it mean, do I need the CIO code book or is it some type of Al Quida pass through? Anyone know?
2) oscillations Constance nonperishable fiddles
I don't have a clue what this means, nonperishable fiddles?
3) bus international Pickford?reticles crickets impressible levity unanimous
Is this a multiword Anagram with special Google algorithm meaning designed to improve rankings and SEO results?
4) baselines configuring brambly gunshot braves doubt.dualities sacrifices pawnshop awkwardness prurient overlooked oppositely poetries
I know, I know, I must have too much time on my hands, I just like to understand and figure things out, there must be a purpose, anyone got a clue?