Profit is the attraction (8)
I believe the answer is:
interest
I believe this clue is a double definition.
'profit' is the first definition.
(I've seen this before)
'the attraction' is the second definition.
(thesaurus)
'is' is the link.
(Other definitions for interest that I've seen before include "Money paid on a loan" , "Excite the curiosity of (someone)" , "Stake; concern deeply" , "Deep concern - premium paid for use of money" , "something that is enjoyable" .)