You can do this with the usergroup permissions by default. Usergroup "a" has no avatar or profile pictures activated. After "x" amount of posts, they get moved to usergroup "b" which has them enabled.
This method may seem a tad faster to everyone, but it is somewhat redundant to add new code to perform a default function that comes stock with vBulletin.
This is just my opinion. Some users will likely find this useful. I myself prefer to use the default promotions system.
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