X likes are very similar to the Facebook "like" button. The more likes a X post has, the more weight it will hold. The combination of retweets and likes is what will give additional X users confidence to share your post as well (or even become a follower of your profile).
Many of our customers purchase X likes for every new status they have, and others purchase likes only for important statuses (such as sale posts, discounts, special announcements, contests, etc). There's no right or wrong amount of likes to purchase for a X post.