To delete or not to delete? That is the question.
Let me paint a picture. You've been using HubSpot for a while now, maybe a year or more. You're coming up on renewal and the amount of contacts you've collected mean that you're looking at having to graduate to the next level of account type.
Currently the Basic level account allows for 100 contacts, Professional gives you 1,000 and Enterprise allows you 10,000. At renewal time, if you are above your allotted contact level, HubSpot gives you two options: either increase your account level to the next tier or stay at the same level and pay a little extra for the number of contacts that you have over the limit.