Well Perry, as has already been pointed out, you may have had a point years ago when they actually WERE vastly different price points, but Alamy RF prices have dropped like a rock the last couple of years as micro prices have risen.
The price difference for Royalty Free images is practically nonexistent anymore (lets not confuse this with what they charge for RM because those images aren't on the micros).
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I really don't understand what you're saying... My last Alamy RF sale was 131 dollars for a 678 x 452 pixels image.
I have sold some other ones for 488 dollars (full size)
Those doesn't sound like micro prices to me... I would feel quilty if I sold the same images elsewhere for just a few bucks.