Out of interest, I researched robot-domain sales prices via dnsalesprice.com The dates go a few years back. And there are a few big sales. Still, here is a list, along with selling dates:
Robot me $2,000 11-Apr
PRobot com $8,500 13-Feb
RobotForex com $2,000 12-May
RobotApps com $2,500 12-Jan
MyRobot kr $1,950 11-Sep
MutantRobot com $600 11-Jul
RobotArm com $5,738 11-Jun
RobotShop at $1,728 11-Jun
DomesticRobot com $1,000 11-May
RobotService com $2,100 11-May
RobotTraining com $2,000 11-May
LittleRobot com $2,222 11-May
RobotMagazine com $4,800 11-Apr
HotelRobot com $2,820 11-Mar
RobotAspirateur fr $1,390 11-Mar
MyRobots com $2,500 11-Jan
iRobot es $5,000 10-Jul
TravelRobot com $6,000 10-Feb
MyRobots com $2,500 10-Jan
IRobot fr $1,490 9-Oct
RobotShop in $1,984 9-Apr
RobotShop mobi $800 9-Apr
RobotPlaza com $1,363 9-Jan
TankRobot com $135 8-Dec
OneRobot com $161 8-Nov
ClickRobot com $500 8-Nov
DriverRobot com $300 8-Oct
MyRobot net $1,327 8-Aug
BuyRobots com $900 8-Aug
RobotReviews com $2,000 8-Jul
RobotTv com $300 8-Jan
RobotShoppingCenter com $90 8-Jan
WeldingRobots com $50,000 7-Nov
HumanRobot com $3,101 7-Sep
HouseworkRobots com $250 7-Jul
RobotSpace com $2,317 7-Jul
LittleRobot com $500 7-Jun
Roboter info $2,652 7-May
RobotShop us $2,200 7-Apr
RobotMilitary com $265 7-Apr
HydrogenRobot com $300 7-Mar
LawnCareRobot com $225 6-Dec
CareRobot com $250 6-Nov
GoldRobot com $135 6-Nov
RobotAutomation com $3,100 6-Oct
RobotsIndustrial com $600 5-Dec
RobotDolls com $500 5-Oct
RobotWork com $399 5-Jun
RobotLiquidators com $450 5-Jun
ManufacturingRobot com $1,500 5-Jun
UsedRobots com $5,000 5-Mar
RobotMatrix com $600 5-Feb
WeldingRobot com $850 4-Nov
Robots com $40,000 4-Oct
PersonalRoboter de $3,503 4-Aug
Average selling price: $3,407
The average is inflated by that $40k sale, but regardless, seeing how many sold per year, I don't see any real hope for these domain at the present -- although they might pick up soon. There was a time when all .me were considered a terrible investment. And now, many of them sell pretty darn well