The reason we dont allow > 300kb is because of abuse and newbies.
They like to upload huge programs and maps that really are stupid. It happened before, so now we got it so you cant upload files unless its under 300 kb (optimal for Battle.net)
No offense to you bolt. 666kb is a tad bit too much for 56k'ers and AOLers.
I raised the limit to 450kb. Thats it though