If you are talking about buying Ads on Instagram, my answer would be no.

But if you are referring to buying promotions on other people’s pages, it really depends. There are several factors you must take into consideration:

The engagement of the account;

If it is daily active or not;

If it has past experience and results to share;

Your fit with that same account;

If you are both on the same niche;

If the audience of the account is targeted;