I will get you 200 favorites for your one listing from real etsy users.
It will always be more than 200 but never less than 200 hearts.
The more times an item is favorited the higher it ranks in search results.
If people favorite your item, and someone who follows them sees the item, it could spark their interest. More people get to see your item, including people who may like it enough to buy.
This does not guarantee any sales but it helps in promotion.