@Krim
its lovely despite the fact that most servers have autotrade
But I don't agree with any incentive. Its the peoples choice if they wanna write a review or not. If others don't choose to, don't want to or simply are too lazy to oh well. The only thing that you could do is stimulate them if they are your friends or write a review your self. As Ellie said I think even a nothing but for the pure fact that its just a sprite type of gear is allowed for such a thing. And if a server is as great it shouldn't even need an incentive of any kind.
The main reasons that this server isn't as populated is that its over 3 years old now and has a lot of higher fully geared based players, doesn't have donatable gear that would make up for that fact right away, doesn't have commands like @s and @go as well as the ability to duel client, and last but not least it is very strict on its rulings, more so then other servers. Usually lower rate server aren't as popular as the mid rates. I doubt you'll ever see a low rate on Rms top 1 spot.
All I'm saying this is enjoy what you have
*edit*
I wrote this while Kirm and Kull hadn't posted yet XD
