Doublejack is very efficient, clearly, and so far I think its been established that not much added to it helps. I think Lighthouse about breaks even, Fishing Village is net positive, and everything else... not so much.
What about a single Warehouse? Is Jack/Warehouse a worthwhile opening? My thinking is that warehouse will get the Jacks played more often, and helps clear coppers and provinces out of the way. Is two Jacks + Warehouse better than two Jacks alone?
