At Fotolia you are allowed to set you own price for an Extended RF License within a range of 10-50 credits (of which you earn 35% as a contributer with a bronze rating). What criteria do you use to set the price? Obviously you want to earn the maximum revenue, but you still need to be competitive with other similar images (which varies widely).
When I first started uploading to Fotolia I did not pay too much attention and at the time I left the price of the extended license on the default of 10 credits. Lately someone is buying quite a number of my photos at this ridiculously low price (good for him, bad for me). Now I am increasing the price on all my photos still set at 10 credits, but I am hesitant to increase it to the maximum of 50. Obviously the more popular images should be set higher and the less popular ones lower. What do you do? Also, is there a way to change the price on all your photos at the same time, or do you need to go to each individual photo? Doing this for all 450 photos in my portfolio is quite time consuming.