i think it depends what YOU are looking to get out of it-
adding "fluff" words do dilute the value- but again, if you wanted desktop.com, and could not get it, and got MyDesktop.com, you would still make money.
unless you have deep pockets, verrrrrrrrrrrrry deep, you cant get a hold of pure generics, and names, providing the are solid words, can sell with an extra word or so. will you make the big kill? no, you wont- but can you make money? yes you can.
GoVoip.com sold for 5600.00- obviously voip.com would be killer, but i would have been just as happy with the 5600.00 for tthe secondary name.
Pay.com > Killer- but GoPay.com sold for 15 grand. nothing to sneeze at.
Bike.com > fab! but CoolBike.com sold for 5100.00.
so, all in all, had i owned and sold coolbike and GoVoip, i would be thrilled with a 10 grand payoff from a 20.00 investment.