I have to agree with The Squid... taking one (or 2) central doctrines and then a bunch of restricted troops is not whoring.
Really, its all about theme. Killersquid's is about a skaven guard, so his additional doctrines reflect that theme - Ogrynn (rat ogres), priests (really crazy rats), and the like.
Mine is a bit more complex - its an Chaos infested planet that was virus bombed and then (much later) recolonized. Its an Eclesiarchical planet, meaning it doesn't have to provide tithes to the navy or the imperial guard - and also meaning it hosts a schola progenium (the place they train stormies, commissars and inquisitors). My own army is a PDF force that found its way into the IG through extra-ordinary means (inquisitorial fiat - I often field a WH inquisitor and stormies with it).
My own doctrines are conscripts (with no tithes, the jails fill up - that's where the navy typically draws its gangs), independent commissars (the schola), stormies (the schola), psychers (the ex-chaos) and one other doctrine that will be rough riders (camel borne scouts - its a desert planet).
These themes are at least as credible as those for the GW "famous regiments"/
I can't really say how meeting a theme is "whoring"... now, perhaps those that just take COD, ID, LI, DT (or a combo there of) and then spend their doctrines willy nillly... that might be whoring.
Inquisitor Psychologis Ruminahui