I'm putting an 8' long counter with cabinets under it in my basement at the moment. If I had to pay a contractor(s) to come in and do it including--
Construct the stub walls
Install the cabinets
Wire the counter for lighting and power
Drywall
Install a countertop (haven't decided on what I'll put in quite yet)
Trim and finish
I'd bet it'd run close to $10,000 in labor and materials, maybe as much as $12,000. My cost doing it myself by knowing how to do it right to code, is going to run about $3000 in materials total. People simply cannot afford to have stuff done like that unless they're pretty well off.
GC's like me to do electric for them because I'm affordable only because I need the exercise not the money. I can run permits when necessary, do the drawings and such too. That saves them a ton over having to hire an engineer and do the permits themselves. I'm waiting right now to hear back on two service panel upgrades and rewiring one of the worst do-it-yourself house / additions I've ever seen (this house is plugged into an RV-style service and one of the two subpanels in the house is ungrounded and undersized wire supplying it).