Where are they getting the money to be smuggled?

I've been watching Border Wars for a while. It is a real time true documentary filming the Border Patrol and ICE operations at our border. There is an endless stream of Illegal Immigrants sneaking over the border, some for work, but a large portion smuggling drugs of all kinds. The ones coming here for work confuse me! Some of them have tried more than a dozen times! They have paid someone $3000 or more each time to help them do it...and it fails a good number of times. My Question: Where do these alleged poor, destitute, starving Migrants get that kind of money...over and over again? Seems to me they could stay home, keep all that money, and quit wasting it!

Wasting Money and Time?