I get tweets from @kolhaolam sent to my texts (in addition to @dansdeals obviously), they recently started posting a lot of ads. Last week some guy was advertising an ESCO for 5.57c/kwh, I contacted him to see what his "deal" was and he said he was flooded with responses. Hashem yishmor.
I have advertised with a bunch of these email blast lists and generally get a fairly good response. The only one I did not make back the investment was Axiom (now Kosher Media) which seemed to be on too many blacklists to be worth it anymore. I think that most of these lists start off good and eventually get blacklisted so end up in spam.