Well that's a given. No one expect you to be an angel. but giving without expecting a return or having a hidden motive is a blessing in our times, and it goes a long way, also in the business world.
People value it when you help them, clearly to without expecting a return. it doesn't even mean you have to be kind, cute or too nice. it just should be something within your core values "to do the right thing" - and mostly helping others is.
if it end up helping you eventually than its a win win. and what about planning those "wins" ahead? your'e either a genius, or watched too much Netflix, but you still don't HAVE to be a dick (op)