I think this campaign is not too attractive to many traders. because most people deal with very little and only a few have great wealth.
such as me, I only trade about $ 1000 per day and usually pay about $ 5 - $ 10. and additional cost reductions will not have too much sense to me.
$10 a day is $3650 a year. Multiply by 20%, that's $750 savings a year, I'd say it's a nice little holiday you just got yourself for free!
But I understand what you mean, I recently made it to VIP level 2 so I have around 600 BTC per month in trading volume. I can tell you that with these amounts an extra discount really makes a significant difference.