Diecast toys come in three flavors.
either they use a VERY THIN coat of paint so as to not obscure the details.
This leads more to paint flaking off, than chipping... especialy on raised areas, and can spread quickly. over time, you end up with this.
or they SLOP ALOT of paint on it, trying to get better coverage. this tends to make the paint job look pretty good, However it can obscure small details like panel lines. AND if it chips, it leaves deep pock marks in the object. like when you get a paint chip on a car door. or on EARLY transformers toys.
The third option, is leaving the metal bare and unpainted. possibly just chroming it.
this only works for bare metal looks, AND it can rust.
BEST case scenario, the chipped paint might look like realistic weathering.
worst case scenario, it makes it look like a cheap toy.
IMO diecast only does one thing for " high end collectables"
Unless it's used inside the feet, and not exposed. used soley for adding weight and making it easier to balance, it just Cheapens the product.