As a corollary, I'd also say that it's is the helper's best interest to help someone *'deserving' not just someone asking for help. This is easier said than done. For one the helper must do a lot more wok than helping.
*=one could have a big discussion on who is truly deserving.
Also we there are many definitions of 'help' which of course I'm sure you are aware of.
Some people think of the postman who brings them letters as "helping" but I don't consider it that way as they're being paid.
The people who volunteer to charities are helping, I guess... Though some of them may just be looking for future leverage/opportunities; e.g. padding their resumes...
Some people, especially who have money, tend to struggle to isolate the monetary incentive and discount the value of money being given to the person in exchange.