What is "spaving," and is it good or bad?

The video explores the concept of 'spaving', a blend of spending and saving, where consumers spend more to save more through discounts and deals. Public opinions vary, with some seeing it as beneficial and others as a path to overspending. Experts warn against unnecessary purchases and suggest sticking to a budget. Spaving can be advantageous when buying non-perishable items in bulk, but only if they are needed. To avoid impulse buying, experts recommend removing saved payment info and unsubscribing from deal notifications.

According to the text, when does buying in bulk make sense?

What strategies can be employed to avoid unnecessary spending?