Ok, sorry for being ignorant here..

I thought PhotoXpress was a free (or really really low pay) site and we weren't getting paid for any downloads and that the images were sourced from free donations from Fotolia.

But, I see that there are 2000+ of my images, 2000+ of Lisa's images, 16,000 of Yuri's etc.. and often the best sellers.  Are we getting paid for these downloads? I haven't opted in to giving my images away for free anywhere - at least not that I know of!!!

Glad I'm not the only one clueless here.  To easily find your port just search for your real name + photoxpress.  Here's your port lisa
http://www.photoxpress.com/search-stock-photos-photographer/Lisa+F.+Young/345011

I contacted the chat support on Photoxpress and they said this

Please note that Photoxpress is an affiliate partnership of Fotolia.com. It means that we work as a Fotolia reseller. This will be double benefit for you since you will also get a commission for each sold file and you can see all this information such as your sales, from your Fotolia account.

Good sleuthing Tyler!  So apparently our content is not being given away under the free scheme.  I assume we are getting paid for the downloads through the affiliate program then.  Of course nothing is transparent