There's an update to this. Because I stopped short of purchasing these 'credits' and just closed the site, a day or so later, Thervo contacted me as to why I didn't buy these 'credits'. Briefly, I explained there really wasn't enough return on investment to bother and they offered 15 'free' contacts to prove that I was wrong. Well, it's now the end of May and, while I did have ONE other contact (in 4 months), the party never responded, so I'm thinking I proved myself correct in my assessment of this 'service'. In other words, DELETE.