Many people buy from Harbor Freight for the following reasons:
I needed a MIG welder for a couple of small welding jobs. This is a tool that I use only a few times a year. As such, cannot justify (or afford) spending over $1000 on a Miller welder. The HF welder did the job admirably, and is now available for occasional usage.
On occasion, I have the need to go to a local u-pull-it junkyard to get a part or two. I am NOT taking my expen$ive Snap-on sets of sockets and wrenches! Once again, HF to the rescue. If I lose or break a socket, I can take comfort in knowing that I don't have a lot invested.
Harbor Freight brings otherwise unaffordable tools into the realm of the home user or occasional user. Tolls that would otherwise be simply too expensive for occasional use.