I'm sure I know the context, but if it were me, I would probably phrase it this way instead: "You haven't told the group about the reward. Everyone is asking for it and you're just riding on their labor! Shame on you."

The sentences are difficult, but not impossible, to parse. The reason for the difficulty is that you place phrases far away from the words that they modify. For example, "as of yet" modifies "have not said" but is located far away. "in the group" modifies also modifies "have not said" but is far away. It is not clear to what "it" refers. What are people asking for? The reward? Saying something about the reward? Both interpretations are plausible. To create clearer sentences, place phrases adjacent to whatever they modify: "As of yet, you haven't told the group anything about the reward".

The grammar is fine, but it's not very natural and the meaning isn't clear. If I understand your intended meaning correctly, I would suggest: You still haven't told them when you're going to pay what you owe them. They really want to know when they can expect to get paid. They're tired of working for free. Shame on you!