only the bad moon clan will have a disproportionate number of flash gitz. a bad moon ork's teef grow unnaturally quick and therefore they simply have a fairly limitless supply of currency!
the biggest orks in a bad moon warband are undoubtably encased in mega armour and their shootas have likely had numerours 'kustum jobz' done on them... (so basically you can think of them as flash gitz nobz in mega armour!
)
the other tribes tend to look down on the bad moons as they envy their wealth! or else the tribe, such as the snakebites, simply have a perverse disdain of any technology more complex than a basic shoots/slugga!
still others, such as the goffs like to prove that they're the 'ardest of all and prefer to fight up close and personal, meaning they just don't take the time to shoot their enemies up first!!!
cheers!