Prayer is ultimately a very selfish endeavour.
The vast majority of people pray for a favourable outcome to some specific situation that affects them and their loved ones.
"Please don't let my grandfather die a lingering death from leukaemia"
"Please let me get this job I'm being interviewed for tomorrow"
"Please let me win the lottery"
"Please abolish hunger, poverty, disease, war, cancer, malaria.... and my neighbour's tree that drops leaves into my garden every year"
It's a bit like writing your list for Santa. Only the odds of getting the gifts you want for Christmas are pretty good.