1. How much Master Wang lost depends on how much Master Wang spent on this matter. To buy 30 yuan, Master Wang spent 30 yuan; Customers buy shoes with counterfeit money from 50 yuan to 20 yuan. Master Wang asked for 30 yuan, and Master Wang paid 30 yuan. . . There is no counterfeit money in 50 yuan, so Master Wang spent 60 yuan this time.

Master Wang and his neighbors are misleading. . . Master Wang changed the counterfeit money of 50 yuan into the real money of neighbor 50 yuan, and Master Wang earned money from 50 yuan; Neighbors found that 50 yuan was counterfeit, and Master Wang lost money and spent 50 yuan. Solution: 50 yuan handed over by Master Wang belongs to his neighbor. So Master Wang spent 0 yuan this time.

The two total expenditures add up to 60+0=60 yuan.