For the lists that got more than 3000 followers, how many did the users who created those lists are paying subscribers?
got more than 3000 followers refers to list_followers > 3000; paying subscribers refer to user_has_payment_method = 1
SELECT COUNT(T1.user_id) FROM lists_users AS T1 INNER JOIN lists AS T2 ON T1.list_id = T2.list_id WHERE T2.list_followers > 3000 AND T1.user_has_payment_method = 1