If you really think about it, you are being a total douche when you pray for anything
You are basically telling god... that you know what is best, more than god does
By praying, you are saying...
"Hey god, I know you don't want to give me a new car, but I want it anyway"
"Screw your perfect/divine plan god, I want a new car... me me me me me me, it's all about me"
If it is god's will... why are you trying to change god's will?
Do you really think you know better than god does?
Or, are people just selfish and don't care what god has planned?
We all know that we need to pray to God who created to us. Our plan we need to ask God if this plan are good to us or not.
And praying is the way to talk God we can tell to him anything our plan we ask him to guide us what is the better we do in our life.