From my personal experience, I've found that although we have sayings such as "The squeaky wheel gets the grease," which more often than not is true, in a different circumstance, sometimes it's better to not ask for too much and you may get more.
I have often observed those who think nothing of asking others for favors. It gets irritating after a while and causes resentment. The habitual "askers" then wonder why people are avoiding them. On the other hand, there are those who even in times of hardship, refrain as much as possible from asking for help, and yet seem to receive willing, unsolicited help. I believe it's human nature to prefer to do things voluntarily rather than feeling forced to do them.
The squeaky wheel saying pertains more to one-time situations, such as customer service issues rather than personal interactions with friends and family. I'm sure if you keep complaining at the same establishment, you'll eventually cause resentment and get less and less grease.
So let's ask ourselves if we are asking others for too much, too often, before "The needy wheel gets abandoned on the side of the road."