I created this plugin some time ago for my own server, but as it doesn't exist anymore I'll post it here for you 
Every 1 minute each player online recieves 1 superhero ticket. You can gather a lot of those and trade them for XP. That's it.
About the plugin:- SQL Only, sorry but i will not make with NVAULT because i don't like it.
- Log every trade in a .log file.
- It's very easy to edit and to install.
- TOP15 Online Tickets.
- Very good to keep players in your server.
To install this plugin you need a SQL Database (every hosting plan has one) and edit this line:
PHP Code:
new host[] = "host", user[] = "user", pass[] = "password", db[] = "database"
The plugin will create automatically the tables.
SAVE
The plugin save Player's Tickets in disconnect and load when connect automatically (STEAMID OR NICKNAME).
PLEASE USE STEAM!
Credits to Alka with this plugin:
http://forums.alliedmods.net/showthread.php?p=457071
I recommend to use an Anti-AFK with my plugin.
Feel free to edit and use as you wish.
Sorry if there are errors in English. Let me know and I'll fix.
TheWalker.