#1-Classic Staff probably give rewards for hats but nothing for scripting.
#2-Era has a really small map and scripters can be Hitlers and spawn 15 monster at the same place.
#3-Zone is kind of new and people will get seen much more since Zone hasn't falled for hats and their evil plan of controlling Graal.
#4-It's easier to make a hat then scripting.
#5-As a scripter you'll need to make scripts for the 1 trillion hats, the 1 thousand mounts, the upload system, the 25 bodies in the small shop, and all those hats shops. Seems reeeeally fun....
#6-They don't tell which scripters made the new area or scripted the new area.
#7-Hats Makers... I mean iClassic Graphic Staff, get thank you for making hats and are loved by Classics Players... Scripters don't...
#8-They don't ask for scripters but for Hats Makers.

If you want more scripters...
Then try to make it fun for them too!
None actually remember their names... But everyone will remember the ones who made a event for a hat! If you give them a part of merit by I don't know telling their names in News when a new shop/area/quest appear written in underlined(sorry if it's not how you write it) the ones who just want to be popular and I don't know much more popular? gets to have their name in News when a new area get added they'll probably want to learn how to script only for that! Many people don't even know scripters because they are at the end of the list of active admins...