I've seen this before on another forum board with the same negative results.
When hacks like this are put in place that force members to make so many posts to use it. They might see this as being too "strict a rule" being forced upon them and take a total dislike for the site policy in doing this. Nobody likes to be forced to do anything full stop, and least of all on the internet were they don't really know you from adam.
And thats were the bad feeling comes into play. It doesn't matter that it's only 5 posts a day, it's the sheer fact there being made to do it to use the arcade.
No doubt when they asked for an arcade game, they didn't expect to have to post X amount of posts per day to use it. So I'm not really suprised there up in arms.