Yes Luis you can answer with an opinion too. 

What I'm looking for is a hypothetical RF Microstock type image site. Small images 4-10MP size. (that's funny, I think some of those used to be called Medium size?)

But for people who run a site, what price do you charge for that size image license?

The reason for asking is I see one place where the lady charges pretty much $1 for anything or $2 for some special images. At that, I don't know how anyone can consider it anything but a hobby or charity. She does sell CDs for $29 with 500 images. I suppose that's the real market?

I have no interest in selling collections or CDs, just single image licenses, RF, at a flat rate to keep things simple.

So what's a good price to not be price cutting and keep the market value up for everyone. No way any of us can compete with 25 a day subs, but individual sales, there should be a reasonable price level where buyers don't run away and where sellers aren't cutting their own throats.

Flat Rate Pricing for RF, 10MP and down size images.

I'm selling 4 sizes.  I kept it just at 4 sizes to keep things simple.  I don't have a $1.00 size.. perhaps it's important, I dont' know.

http://www.realstockphotos.com/
Small:  450 x 300 px - $2.00
Medium: 1000 x 667 - $5.00
Large: 3000 x 2000 px  - $10.00
Original: 5616 x 3744 px - $15.00

it looks very good, 6MP for 10$ seems ideal, how about the max size for subscriptions?

From X-Small to Max Resolution, our current graduations are $3, $6, $9, $11, $13, and $15. Extended License is $129.