Thank you Tacolinowest and Spanker!
About durability, it is depend on many factors, like lifestyle, how you make the maintenance, how you comb..
But a intermedium lace thick, can last 1 year, so client will need between 1-2 pcs per year. One custom piece cost 190 $.
Not always you have you buy new piece, if old piece, the hair still show goods, you can repair it, so average cost anual is relative.