What I've been doing is running my multitrack and including a typical set of "taper mics" into the recorder, meaning on a stand near the SBD. I'm not saying it's the best way, just that it works for me. Including a small amount of this in the final mix adds a little bit of "fatness" and natural reverb along with the crowd cheering after a song. If there is too much chatter in places, cut back on the AUD channels in the mix. Plus I can patch those channels into a small deck so I have something to listen to on the ride home.
I tried running ambient mics on stage, specifically 414's subcards. What I got was a serious phasing/timing issue. When the drummer hit the snare, I got a snap into my mics 6 feet away, then I got another snap from the stacks overhead, but they were 40 feet away, so it was "snap-snap" from the time delay. I decided not to use those channels, and I kind of gave up on that approach. I have clamped ambient mics to the overhead light bar, and that worked better because it so happened that the distance-to-snare-drum and distance-to-the-stacks was similar, but depending on the place, it can be a bitch to hang from the light bar. I need to keep experimenting.
What I see "the pros" doing is putting mics fairly near the stacks pointing outward, frequently shotguns, and perhaps inverting the output. This way they capture crowd noise, capture stack sound without delay, but probably not much on stage sound, so no timing issues. It's a good way to add crowd cheering, but I it doesn't add the fatness and ambience.
I think these all become "tools in the toolbox", but I admittedly have a lot to learn regarding which tool is the best for a particular setting.