When do you intentionally overpay for goods or services? Are you haggling with your mechanic, landlord/mortgage lender, or grocery store to pay them more money

When do you intentionally overpay for goods or services? Are you haggling with your mechanic, landlord/mortgage lender, or grocery store to pay them more money than they're asking for, or do you purposely seek out suppliers that do not provide the offering with the best value?