Renderosity cannot stop vendors from removing products from their store should they wish to do so.  Nor can Renderosity mandate that these products be made freebies.  That is totally up to the discretion of the vendor as they are the ones who hold the copyright.  Some vendors have, indeed, released older products as freebies while others have not.  

If you really wish to obtain a product no longer available for sale you may contact the vendor and see if they will sell it to you.  I've had success with this in the past. 

This is not really a matter of making sense or not.  Vendors have the freedom to decide what should be done with their products and the final say.  Thank you for posting your opinions as I'm sure vendors frequent the forums and will see this thread. :)