Of course farm groups are obsessed with high DPS... They're farming to try and get something as fast as possible, so the faster they clear the faster they get what they want. If I'm farming for light and I know with good DPS I can get through X number of runs which will net me Y amount of light, anything less that that costs me. Say it's a 6 minute run... over an hour you can get 10 runs in. If it's 5 points per run then I can get 50 points in an hour. If the run takes even 1/3rd of the time longer you're losing 2 minutes per run. That means you maybe 7 runs per hour or 35 light. That's 15 light per hour loss for those extra 2 minutes a run. DPS is everything in a Farm group, it's what they're all about.