even if the max sockets was 6, you still would have a chance of 5 sockets using the add socket recipe in the horadric cube
i had a nice little scheme at the start of 1.10 when everybody & their gran was trying to buy 4 socket flails, i would just farm areas in nightmare collecting all the white flails that dropped and using the cube recipe on them. I turned about 7-8 useless flails into nice little trade items this way