Without getting all woo woo on this point, it feels very intuitive that helping others will come back to you in time -- not so much in a tit-for-tat kind of way (and sometimes we miss the signs because that's what we're looking for), but in a Living Karma sort of situation. I certainly feel it in my life.
Respect crosses borders and boundaries, a smile can be a miracle, and helping others helps us be less nauseatingly selfish (which is good for everyone, amirite?!). Eras come and go but good old fashioned Being Nice to People has never gone out of style (except in certain neighborhoods in New York. possibly all of them).