You have to wait 6 minutes between posts and can only send 5 PMs per hour which makes it extremely difficult to conduct business, especially when you have close to 4,000 PMs in your inbox. It drops to 74 seconds when you have 15 activity and 60 seconds with 60 activity and still have severely restrictive PMs limits.

You can earn .0015 per post with a hero account so you could make .6 per month by making 400 posts which is not unrealistic