Thank you for giving it another go <3
To have "perfect" condition you have to use brush on trhose tiles, where artifacts are. As for money... Well, it depends. Condition do affect price, but also what you dig up. There are some common artifacts that worth 500 coins and some that are just 10-15(I guess you dug up some nails :D)
Anyway, thank you for playing our game and hope you will be back when we give it some good polish and balancing later :)