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A better study would be to look at the IRS' data on income by marital status. Rather than relying on a sample size of 1,000 people, you look at all tax-filing individuals to see if the incidence of marriage rises with income.

As you can see, there IS indeed a strong linkage between adjusted gross income and marital status:

All returns - ratio of (married filing jointly and separately returns) to total returns in this segment, or 18%

No adjusted gross income (includes deficits) - 0%
AGI of $1 under $5,000 - 1%
$5,000 under $10,000 - 1%
$10,000 under $15,000 - 1%
$15,000 under $20,000 - 1%
$20,000 under $25,000 - 2%
$25,000 under $30,000 - 3%
$30,000 under $40,000 - 4%
$40,000 under $50,000 - 7%
$50,000 under $75,000 - 14%
$75,000 under $100,000 - 30%
$100,000 under $200,000 - 59%
$200,000 under $500,000 - 81%
$500,000 under $1,000,000 - 81%
$1,000,000 under $1,500,000 - 78%
$1,500,000 under $2,000,000 - 78%
$2,000,000 under $5,000,000 - 78%
$5,000,000 under $10,000,000 - 81%
$10,000,000 or more - 82%

Basically, once you hit $500k of AGI, half of all tax returns by AGI bracket are from married folk.

Further, the proportion of filers with AGI over $100k is 66%; that percentage for single filers is 8%.