I do not believe that was a selection based on convenience.
The American Dream has a sense of social and/or financial mobility to it, but most of all, from what I can extract, it is about an ever-present opportunity to "make it." Fail miserably? Try again. Bankrupt? Maybe you'll make a go of it this time. Effort is part of it, yes, but an acceptance of the role of pure luck is also a vital component. You can bust your ass and it will likely turn out better for you than not busting your ass, but there are no guarantees. You can only approach the table and go again. Another role of the dice or the hope that you haven't drawn a bad beat.
I will not bore you with how that works into the novel, but one point to take away was the sense that the Dream was moribund, if not already dead. A sense that credit scores, background checks, and "I hope you know that this will go down on your permanent record" mentality is a noose slowly drawing shut. No more second chances, or third, or fourth. You screw up, bucko, that's it. The American Dream is now a taxidermied carcass whose silhouette we can see in the window of a house on a hill: referenced as if it were still alive, but never met.
Now, we see people who have made it big, but some section of them are products lifted from the mud and polished for public consumption. Others, when investigated, come from surprisingly fortunate backgrounds. Sons of senators' sons, as Jello Biafra put it. This has been sensed on an unconscious level since perhaps the mid-eighties.