Stake was indeed rewarding the users in the old days who were engaging in the discussions (making posts) on their forum. The pay per post feature was also available at Primedice forum.

You wouldn't be able to earn a lot of amount. Because there were some limits. I can't remember it correctly, either it was max 10 posts per day or max 10k satoshi per day. Moreover, the pay rate wasn't same for each post. I had received a decent amount on both Stake and Primedice forum by making posts. Bitcoin price was low at that time.