ExoClick is rather new so it will take a while to gain some momentum. I advertised on ExoClick before and it seems alright to me. Though I prefer AdToll and AdEngage's model of business. Just a personal preference.
Don`t use Exoclick if you want to promote something!!! I`ve recently tried to spend $50 to see what happening. In 1 hour my credit was consumed and the results was 0 clicks. They are stealing money from people
Yes really feels bad when such ad networks only run by scamming people both publishers and advertisers.