Sorry if the word "workstation" implied a desktop. I mean to say "mobile workstation", as in a laptop that has workstation-grade hardware and warranty support.@ Spac3nerd
It's not about the weight but convenience, time, and logistics. Having been to my share of LAN parties, a gaming laptop saves lots of time and energy by not having to deal with hauling, managing, & plugging in all types of cables between the tower, monitor, peripherals and no issue with enough working space to set up shop. Less time with these issues equals more time gaming.