LifeSiteNews:

A study by researchers at Brigham Young University focusing on marriage stability and relationship quality found that materialistic couples may have more money, but also have more marital problems.
An analysis of data collected from 1,734 couples showed that even among spouses who shared the same materialistic values, “materialism had a negative association with marital quality.”

Each couple completed a relationship evaluation, part of which asked how much they value “having money and lots of things.”

... The researchers’ statistical analysis showed that couples who say money is not important to them score about 10 to 15 percent better on marriage stability and other measures of relationship quality than couples where one or both are materialistic.

Here is where the research can be accessed online:

Carroll, Jason S., Lukas R. Dean, Lindsey L. Call, Dean M. Busby. "Materialism and Marriage: Couple Profiles of Congruent and Incongruent Spouses." Journal of Couple and Relationship Therapy, Volume 10, Issue 4 (2011) [online]