"Yaacov, can you please organize the project for us??"
"There are 50 boys in the Yeshiva, why do only a few of us 'get the call'?"
"Some people have the capability and others don't."
When the Torah tells us that a poor person could bring a very inexpensive
sacrifice (Vayikra 5:11) the Chofetz Chaim, based on a Gemorra in Arachin,
says that a rich person who brings a poor person's sacrifice has not
fulfilled his obligation!!
Rabbi Zelig Pliskin adds, that this concept also applies to people
donating their talents!!