Don't worry about it. Guys here is my idea again in case someone is interested in making it.
Let's say a member has 10 threads of his own and 10 posts ( posts on my forum count as downloads because a member can't download until he has replied) so the ratio would be 1. This is acceptable and if there was like the reputation bar something to show as green for example so the member knows he is safe. But if he has only 10 threads and say 30 posts, then the ratio bar would turn red warning him that he might be moved to the inactive group thus stopped from downloading till his ratio bar goes green again. How will it turn green? By sharing more threads. Hope you got the idea and would be great to achieve it. Thanks for your time.