My biggest objection to this type of product is that it is a...

My biggest objection to this type of product is that it is a rather bad one for the client (a bit like credit card debt - hugely popular but a toxic product) - even though it's not called debt. My personal investment philosophy is not to invest in companies which profit from providing lousy products, and interest free with it's high fees is one such product.

Yes, likely to be commercially successful, but not very ethical in my opinion because it is marketed as though the customer is getting a benefit, when in reality the customer is just getting shafted under a different name.