i am confused now :s.. sorry..
Two-tire works like -
Mr. A refereed Mr. B, Then Mr. A will receive 25% , of Mr. B's Now,
Mr. B refereed Mr. C, Then Mr. B will receive 25% of Mr. C's and,
Mr. A will get 5% of Mr. C
all these % can be setup by admin.
Here is a screen shot for more details :-
Thanks.