In reference to your comments on different mailers, try to remember that these are bulk mailers. Regardless of what your subject line is, or the content of your email, it will 99% of the time go directly to an email clients junk mail folder due to it's status as "BULK MAIL". Unless the addressee reads thier bulk mail, it will never be read.
I also use some of the bulk mail services but do not concentrate on it due to the extremely low rate of positive results.
As for the question you pose in your subject line, "Scam or Not?", the jury is still out on that one. There are some outfits that actually send all the mail it says it will, and some who don't. I have my preferred choices, but only because I've found that they do actually deliver the mail - still the return on investment is too low to make these kinds of outfits recommendable.
Best of Luck!