Common rust areas and whether to bail on a resto

[i82much]

I am kind of in a long-running debate with myself over whether to keep my truck or sell it and buy a nicer truck. A few pics of the truck are shown below.

Truck is a 72 K10 longbed, converted to a 396. I bought it from a farmer in Dusty, WA, which is on the east side (drier side) of WA. Engine runs great, transmission is great, etc. Bought it for 4k-ish and probably have a total of 10 in it between 2.5" lift, new tires and wheels, new intake, carb, front axle joints/bearings, and front end work.

So my real question is about rust. I have a 2" hole in my driver's front fender, and some bubbling in the front of one of the door panels. Also, underneath the molding looks bad and the bed is shot thanks to a slide-in plastic bedliner.

On the other hand, everything else is really pretty good in terms of rust. Is there a particular reason a truck would rust in the fender but not the cab corners or rockers? I kind of figured those would be shot too but they really feel pretty solid.

I guess I am just thinking maybe I would be better off selling and investing more $ in a rust free truck, but I wanted to see what thoughts some of you have before deciding.