MicrostockGroup

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.

Congratulations on your big sales $.  My recent sales have all been under $100 with several of them below $30.  That's total sale price, not my commission.

Clearly it is Alamy itself that has vastly differing price points.  An image can sell there one day for $488 and then sell for $28 the next day, right there on one site.  If you think it is unethical to sell the same images at such vastly different price points then you probably shouldn't be selling on Alamy at all.

It is not in dispute that Alamy's prices are going down or that micro prices are coming up.  Nor is it in dispute that Alamy's commissions are coming down too.  It's all over these forums and Alamy's as well.  

Of course you are entitled to your opinion.  Don't let the facts stand in your way