While I get that this might be hot and 'trendy' to talk about, please give people the important quotes before having them run off to buy the next fad in the meat industry.
"Although the fatty acid composition of grass-fed and conventionally fed beef was different, conclusions on the possible effects of these differences on human health cannot be made without further investigation."
From the study you link: http://www.ncbi.nlm.nih.gov/pubmed/18641180
Layman terms: It might be beneficial, but we're not sure and haven't researched it enough. But it sure as heck is a lot more expensive in the grocery stores.
This study was completed in 2008. There have been hundreds of studies done since then that show omega 3 fatty acid and fat-soluble vitamin consumption is directly correlated with better human health. In terms of pricing, you can purchase grass-fed beef in bulk that will save you quite a bit of money.