to the stupid thinking of only using custom media (when doing a zombieshooter etc.) i want to quote myself out of wolfs interview:
Quote: "* What holds the future for fpscreator and its community? What are your thoughts?
I am not long and deep enough inside this scene to give an answer to this. But looking through the indiewebs, I see 5 nonmod-first-person projects that look really interesting AND that may get finished (very rare), and 2 of them are done with FPSC, another one absolutely possible to do.
FPSC is limited in performance, physics,fx and more. But its cheap, easy to learn and gives you the ability to do some real amazing games. Simply the mass of stock-solutions (not only media but mainly given scripts and tutorials to customize a given frame) is the best solution for solo-developers to get things done in time to get bigger projects finished than in other engines more complex and custom where you need a team to get done without loosing yourself in update after update. But if the kids think a good game is blingbling graphics… better ask Lee or yourself about the future, you are the one that is experienced in gamedev and also other engines." "
i underlined the thing that i want to say in using stockware. this limitation in time most "wannabe-custom-pro-devs" forget in their brain, doing custom media for their project over 3 years and then wonder about why their media look like its 3 years old^^
use stock (and optimize it) is BEST for solo-devs as most of us are.
and another thought around that: have you looked through actual games with the same settings, ignore the bosses (and most of the characters) and you will find masses of turbosquid-highprize-STOCK even in the backgrounds of aaa-titles, same for most media in pro-advertisement, may it printmedia or digital (love shutterstock!^^).
i am a pro designer, and a photoshooting with some models is really nice, but in fact that there is great stockphotography out there, not neccessary in most of the cases, only for your ego so you can say "i got a shooting with 3 superhot models yesterday."

thats part of the game to be a "pro": concentrate customs on the main and stock up the rest is the most effective.
and when there is only 1 interesting item that fits your mind 100%, its worth to buy it for the prize of the whole pack, on turbosquid you will pay tripple for the one single model.