I like to contribute on google maps because of the fact that I am able to help people experience whatever good things I have experience and let them be aware of the things and places which were not worthwhile according to me. So that they can make a wise decision and have a wonderful time.
Another thing is that people who are new to the area also don't get misguided because of such unbiased and worthwhile reviews. I have been trying to cover many local places also which are not being reviewed by locals or infrequently reviewed.