Buying retweets for your tweets will attract more organic retweets from your followers or new people. When a Twitter (X) user scrolls through the timeline and sees a tweet that looks interesting, they usually read and skip it if the tweet has no retweets. However, if they see the tweet has lots of retweets, then the user decides that retweeting is worth their effort. So you can end up gaining lots of retweets, likes, and follows just by buying retweets to a single tweet and make it trending.