Waste. Physical electronic waste and opportunity cost.

For example, these cost more money than an average resident of Sierra Leone earns in a month. You could donate to feed their family.

Or for $550, you could spend $300 on buying a Kenyan family 5 sheep, $100 on gifting 5 Serbian women a month of literacy classes each, and $150 on 15 rides to school for refugee children in Egypt. Taxes not included.¹

¹https://cwsbestgift.org/

Or you could buy yourself a really nice set of $200 headphones and still send $350 to charity.

You're asking what's wrong with wasting money?