T47 BB's - here to stay or a passing 'standard'?

[arcos]

@AJS914

I’ve looked at some Ti frames where T47 is an option and the biggest issue is the upcharge (usually $200-300). I’d be torn between getting an easy to service T47 BB and saving $300.

I wonder if the up charge is due to the increased in cost in material as a T47 BB shell would be bigger as compared to a BSA shell or perhaps it is a combination of material cost plus additional machining? That said, I can’t see why there would be additional machining for a steel/ti frame?