We would like to. ACH is so reversible that it's understandable why no one in Bitcoin wants to use it.
I believe Coinbase offers it successfully.
The only problem is they can only do pulls, not pushes (I think it would require additional licensing in order to accept push deposits).
The day that I can have my paychecks directly deposited in to a trading account is the day that I will close my bank account. Literally the only reason I have one now is to accept my paychecks and hold on to them until the Coinbase pull comes through. It would be great to skip the middleman.