Pointless when there's the M5 Estate.
I personally don't see the point of the 3-Series Touring normally... if you want an estate BMW get the 5-Series Touring.
Well it to cater to a market, there will be people buying new cars who want an estate and can only afford a 3.
There are obviously enough of these customers that it isn't worth just giving up and leaving all these people to walk to their nearest Audi or Merc dealer and buy an A4/C-Class.