MicrostockGroup

Fotolia. They allow you to opt out your exclusive images (and only those) from their subs program.
But I remember reading some comments on the (German) FT forum, that members doing that have experienced dropping sales. Obviously FT takes into account your view/sales ratio for determining search order, so having images not available for subs might impact your position in the search.
As I have no exclusive images with them, I can't give any own experience though.

Does BigStock have a subscription program?  I think they are strictly PPD?
My sales commission has varied from fifty cents to three dollars.

I don't think BigStock has exclusives either.

I have three exclusive images at DT and it would be the fairest thing to be able to opt them out of subs (the fact that I make more than from a non-exclusive doesn't entice me). One of them is a level 5 and it doesn't prevent it from giving me some nice credit sales.

A very clear question to me. 

Correct. I attempted to give up FT subs but lasted 3 weeks. In that short time, I really had the feeling that my sales were dropping and I folded.
On an FT blog there was some info regarding images in subs and how it does affect that image in the search results. Every time an image is viewed in subs, it gathers a point which helps in the search order. Images not in subs get zero points and can quickly become invisible.

As a modest but daily buyer (more specifically image scouting for the real buyer that is a design company in Chennai working for a daily media group) on DT, I figured this out long ago. I even made a post about it on the MSG. The smallest subs pack on DT makes you profit already after day 4 if you are hunting for the higher level = higher impact images. Those are too expensive by credits. As an added bonus, you'll get them max-size. That's why buyers that can count love DT so much.  

After the recent collapse of my earnings at DT I don't care what they do with subs. I want them to keep the current program. This month I made 10x the amount by scouting fees on DT, than as a contributor. You guys really don't see it right? The people surrounding the image industry make much more money of your images than yourself.

Of course, this post will go unnoticed again...  

This could also lead to misuse of the system.  To reduce competition and worsen their ratio sold/view i could hire a third world country guy to click on as many images of top contributors a day except mine.

Patrick.

That doesn't sound unreasonable.

I have 500 images of my port on one site right now (just uploaded) and I have 20,550/0. Yes, that's right, twenty thousand+ views with no sales. Something is amiss and I don't see how that number of views can be right. I have my doubts about sales on this site.

So to bring the conversation back to my original question, it looks like Fotolia is the only site that allows exclusive images with no sub sales. I left them a long time ago because of shenanigans and from what I have read since then, the shenanigans continue and are worse. But I also read that it is a good-selling site.

So if I were to try out the whole exclusive image thing, it looks like I have two options: put them ex on DT, but realize they will be still sold as subs, or put stuff on Fotolia. Food for thought.