I have never worked for them. I logged in a couple of years ago and took a look - but I make it a practice to never pay to shop.
Looks like a scam to me. Volition has some very old posts about them. Apparently after paying the processing fee and becoming their shopper, there were very few jobs to be had and payment issues with the jobs that were available and performed. Those who complained about not getting paid got deactivated.
No one here seems to have commented over the last 4 years when we have had 3 posters ask about them. I'm guessing no one here has worked for them.