Well -- if you're going to be sensitive about the ethics of spec work, and you have no money, then I'd say it behooves you to run a little kickstarter campaign or find backers so that you can actually pay people for work. Virtue in one area doesn't excuse malfeasance in another. The people who get professional exposure by doing this are people who can afford to work for free: rich kids, people with families supporting them, people with no obligations to other people. If you shrug and say, well, too bad for everyone else, I don't see how this is very much different from the behavior of legislators whose general philosophy is devil-take-the-hindmost. At a minimum, it's shockingly careless.
Find a way to pay people you take work from, and pay a market rate. You're obviously enterprising people; go to it.