No not at all.
Firstly it takes all types to want to do this type of voluntary work.... I can't explain that but ex police and military take to it. Then there are likely benefits to doing it, making other problems (perhaps say with immigration) go away. I hear they have their uses, usually getting round the language and culture barriers. Simply explaining to some drunken oaf, to pay his bar-tab, the alternative being to get locked up in a cell with 29 other drunks over the weekend, or to give the girl 200 baht and she will forget the affront of you goosing her.
I had a pal did volunteering.. yes he was a pretentious prxck, but it kept him from doing other silly things.