How are people making money when using contractors?

[John Seitz]

Hello, I am a newbie and a fix and flip virgin. I'm spending a lot of time learning how to analyze properties and finding that the current market offers some pretty slim margins for profit. I'm a DIYer so most of the work and savings will come from NOT using GCs. I'm curious how people are making a profit when using the more costly option of using a GC. Are you accepting smaller profits? Do you just have great relationships with your GC where they're willing to give up their profit margins for volume work? Am I figuring something wrong? Thanks.