To be fair, Si doesn't pay for all such treats.
( ( To ( be fair ) ) ( , ( Si ( ( ( does n't ) ( pay ( for ( all ( such treats ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB be) (ADJP (JJ fair))))) (, ,) (NP (NNP Si)) (VP (VBZ does) (RB n't) (VP (VB pay) (PP (IN for) (NP (DT all) (JJ such) (NN treats))))) (. .)))
Si only pays if they earn over £1000 in a week long period.
( Si ( only ( ( pays ( if ( they ( earn ( over ( ( # 1000 ) ( in ( a ( week ( long period ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Si)) (ADVP (RB only)) (VP (VBZ pays) (SBAR (IN if) (S (NP (PRP they)) (VP (VBP earn) (PP (IN over) (NP (NP (# #) (CD 1000)) (PP (IN in) (NP (DT a) (NN week) (JJ long) (NN period))))))))) (. .)))