The lower level iron sets don't have that long 3 iron and on some of them you're loooking at a 30-40 yd gap from 3 iron to 3W. Granted, the easier tees don't really need anything other than a driver and 4 wedges so the HB isn't really a help there.
All one has to do is look at how often you use a HB vs how often you would use that extra wedge you could have in its place. :-)