If you think that you can get enought use out of it I'd take a serious look at the deal. A carb job isn't that big of a deal, you could do it your self if you have the know how. The brakes are where it could end up costing you but on the other hand it could just be something minor.
If you go for it, worst case you put a little money into the carb and you have a neat shovel for around the house or the shop. Best case you put a few hundred into it to get the mechanics up to snuff and put her to use in your operation.
It's not the equipment that makes a professional, it's the operator.
'99 Dodge Ram 2500 reg cab long bed
'91 JD Lx172 38"/ bagger
'11 JD X300 48"
22'' '66 Western Auto Wizard
21"push mower/w bagger
Stihl KM 90 w/trimmer,tiller, and hedge trimmer
MTD 3.5 HP edger
AgraFab 17 cb ft trailer
Precise-Fit lawn sweeper
"Never Give Up! Never Surrender!"