All non-Premium Listed (aka "Regular Listing") sign vendors will be temporarily suspended from appearing in a PRO for 30 days after they've received multiple buyer requests. The account will be automatically reactivated after the 30-day suspension. Then, after receiving additional buyer requests, they'll experience another 30-day suspension. Rinse. Repeat.
We do this because, while there is no cost associated with a Regular listing, we need to ensure that Premium listed companies that are supporting this cool service have a leg up on those that aren't. We know you get it because you're running a business as well. As a result, Regular listings will be periodically deactivated (up to 30 days) before they will reappear in PRO search results.