the idea behind this rule seems ok for me too,
but locking up 3000 images for 1 year, only for 250 usd doesnt seem right for me,
y may have an opportunity to sell the rights of your images, or you can never know what will future brings to micro stock industry, and i cant say `i will never be exclusive` somewhere because of this.
about fotolia, i was exclusive at istock at these times, so i dont know the details but, as long as i heard, they gave more than albumo?