I have. Some decks like Goblins only play a few duals. Most play zero. Hell, with decks like U/R Delver, you can probably get away with Steam Vents. It's usually the City of Traitors that's prohibitive. Wasteland and Rishadan Port aren't in too bad of a spot right now.
Goblins, Humans, Slivers, Death & Taxes, Dredge, Belcher, High Tide, Enchantress, Pox (without Chains/Void), Mono Red Storm.
For $1500 you can build Merfolk, Maverick (without the one Cradle), Punishing Zoo, Eldrazi Aggro, Reanimator, Buried Phoenix, Painter, Mono Red Sneak.