Depends on your goals. If you buy likes, views, and comments and expect sales without any sort of paid ads, you should rethink your strategy. Buying engagement is a way to self-promote your Social Image. Just think to yourself for a second.
If you owned a e-commerce website, and ran ads through instagram but your Instagram has no followers, would you buy from it? If I saw a company with low followers, I would think it is not established. Therefore, I would not convert.
BUT, if you got my attention, and got me to click, charged your ad account, landed on your profile page and had loads of followers and all around engagement, I would be more likely to convert and click the link in the bio.
Make sense?