We're just not the same as the other 49 states - Washington is an enigma. Our current liquor laws maintain the post-Prohibition era statutory scheme set up in 1933, but the industries it regulates have evolved far beyond what that scheme was aimed at regulating in 1933. Initiative 1105 on the Washington ballot this November would maintain part of that scheme, but the legions of small craft wineries and breweries in the state would fare better than under its competing ballot initiative, I-1100.
Washington has what is referred to as the three-tier system, implemented after the repeal of Prohibition (the 21st Amendment), that essentially requires that wine and beer retailers purchase alcohol from distributors (hard liquor is sold only by the state in its liquor stores), and the state fixes the price. I-1105 would retain the distributor system and the fixed price requirement, but would eliminate state-run liquor stores, allowing private retailers to sell hard liquor. Maintaining the price control requirement would continue to protect the small wine and beer makers and would not give big box stores the advantage of buying wholesale at volume discounts, thereby making the retail price lower.
While Washingtonians don't need the protection of the state controlling where they purchase their liquor, the burgeoning craft wine and beer industry here doesn't need the added financial stress of competing with Costco, Kroger brand stores (QFC, Fred Meyer), or other big box retailers. I-1100 would definitely give the big box stores the heavy advantage in being able to purchase and sell wine, beer and liquor at a significant discount, which would probably lead to the doors closing on many smaller manufacturers of beer, wine, and liquor (Washington recently allowed distilleries to operate in the state - a 2008 state law gives hard alcohol makers some of the same rights to serve and sell as their brewing and fermenting counterparts).
Maybe the reason other states don't have the innovative wine and beer industry that Washington does is because Costco and others competed them out of the market. I-1105 would keep the level playing field.