Interactive Brokers is so cheap, where is the catch?

[andrefre]

I'm not sure I understand. Margin accounts are usually more expensive.

E.g. my vickers margin is 0.2%, my DBS cash upfront is 0.18%.

If anything this is a benefit?

It is margin account, instead of the normal brokerage account. In POEMS, it is called "Phillip Cash Prepaid Account".

It is cheap for good reason(s).