1. The Double Ninth Festival symbolizes reunion and eternal love.
Because the number 9 is homophonic with "long" in Chinese, the 990,000 bride price symbolizes eternal love and marriage.
3.99 is a big number, which represents the sincerity and financial resources of the groom's family.
It should be noted that the bride price should not be the only consideration of marriage, but more importantly, there should be sincere love and mutual respect.