Many years ago I went to the auction of the contents of mortgage foreclosed house with a friend who dealt in antiques & various other items available at flea markets & house auctions. . He bid circa $300.00 for an oil painting which he late sold for $2000.00. It was done by some obscure artist he had never heard of. The other bidder a woman who I assume was bidding merely because she like the painting. I asked him how he knew he could make a profit on it. He replied that a well executed oil was worth at least some number of $ per square foot, making it worth at least $400.00 Does anyone here know the current minimum value per square foot for an oil painting?