Sure, I've heard of MBR rootkits, and they are at the very bottom of the threat list.
In a high value target system, you've already been completely owned before the attacker can even think about installing anything into the MBR. Boot attacks are like slicing the upholstery in a car you've already stolen.
For individuals, sure, boot attacks (especially in systems running windows) are an issue. For a bank? Not really, food poisoning in the cafeteria is a bigger threat.
MBR rootkits are barely on the radar in industry
In a high value target system, you've already been completely owned before the attacker can even think about installing anything into the MBR. Boot attacks are like slicing the upholstery in a car you've already stolen.
For individuals, sure, boot attacks (especially in systems running windows) are an issue. For a bank? Not really, food poisoning in the cafeteria is a bigger threat.