This improvement is good if the average campaign payout is still the same when this campaign is still active which is 60$ maximum pay for highest rank in the forum before. But right now the maximum earnings user can earn even on highest tier is just more or less 60$ for 60 post which can be earned by senior member rank with 20-25 post per week. Their current rate is still not that competitive but still it’s good that LL improve the pay rate.
I doubt this type of 60 post quota with low pay rate will improve the quality of post of participants that will max out the payment per week.
Regarding the quality of posts, it's BB's job to filter each participants. Starting from selecting the participants until they do their weekly quota, all posts will be scanned to avoid spam posts.