As you get older and more "comfortable" you are less prepared to take risks. Simples. It is why most people make their money in the 30's and 40's - although many multi millionaires are risk taking people in their 50's and 60's. The ability/drive to accept risk is what makes some prosper more than others...
Just to elaborate on this, I think the age factor is a major thing when it comes to the DV as I've seen with many real life cases.
Some elder people who are "settled" in their lives don't want the stress of packing up and moving and starting over however if they have young children or teenagers then they do consider it for their sake. To cite some examples as follows:
My cousin's husband's family got the DV about 10 years ago when they were very young and all of them moved to the USA in 2005 I think and he said to me that it was the best thing their father did for them because all of them achieved a better quality of life than Dubai (they were living in a small crubby apartment where all the foreign workers in Dubai live and today they have their own home in the USA) and all of them have decent jobs and pitch in towards the household expenses and keep whatever is left for themselves.
My father's cousin who I mentioned on another post was what I call a DV family. He applied for his sister circa 2003/2004 and she got selected and now lives in the US (this woman had never been to school or driven a car in her life and hardly spoke English and she's got a job there and drives). He then applied for himself circa 2005 and his family (I think he had 4 kids but his daughter was over 18 and was left out) and got selected and he himself didn't even have a high school diploma. He even returned to Tanzania after 10 years to test the waters here and realised he was better off in the USA so he went back. His kids are now all citizens and have basic jobs. Whoever else he filled out forms for also got selected; I mean this guy has REAL luck.
Point being is I think people with families or single people (like moi) are more keen on the DV for the future of their children and being 32, I'd say I've got 10 years of good hard work ahead of me before I can relax so I couldn't have asked for a better age to be able to go to the USA. By the time I decide to marry and have kids I know I'll have settled in properly into the USA and society there.
From another perspective being a businessman its always been about being on the edge and risking it all the way. After all what is there to lose?
To quote Gustav Graves (the villain from James Bond - Die Another Day) "its only by being on the edge that we know who we really are."
Case No - DV2013AF0007XXXX (applied the first time and got it the first time - lucky me!)
Entry Checked - 1st May 2012
Forms Sent To KCC - 10th May 2012
Received By KCC - 12th May 2012
Confirmation From KCC - 25th May 2012 after I sent them an email
2nd NL - 14th June 2013
Police Clearance (TZ) - 13th June 2013
Police Clearance (UK) - 21st June 2013
Medicals - Completed 24th June 2013
I-134 - 16th July 2013
Bank Statements - 22nd July 2013
Interview - Wednesday, August 7th 2013 @ 8am - US Embassy Tanzania
Visa Pick up - Hopefully August 11th 2013
Departure Date - August 17th 2013
Port of Entry - Washington Dulles