An amazing plugin, I've heard plenty of servers made tons of profit from using it.. but Voidy probably has his reasons for example people won't donate or some stuff but let me tell ya something this store plugin can add stuff your donation doesn't have, weapon colors, name colors, name titles and more.
Here's the link for the plugin itself and the possible things it can do.
http://forums.alliedmods.net/showthread.php?t=207157 - Plugin itself
https://forums.alliedmods.net/showthread.php?t=208774 - Store Modules
Feel free to look through it and tell me what do you think.