using the hide feature also protects you from spam message and spam tips  .big players often hid themselves because they are being targeted by beggars  . some are just plain stingy and they do not want someone to see them ( i.e thier friends  ) because thier friends might beg on them  .  ive done that too on the past but i realized that it still up to me if i will give some tips or not , its not thier money anyway   but im trying to give too sometimes if ever i win huge .