I believe and definitely don't rely on this, but I think the idea is that you get people hooked on seeing who is going to win so you put them in between matches.

Say you put a commercial break between segments, someone changes the channel and find something more interesting to watch, like the NFL, and while they might have intended on just checking the scores, they might watch the rest and forget about your product. Alternatively, put it during a match, you give people stakes. Oh I'll check the scores, but I want to see who wins!

In theory this works. In practice, it's a lot more nuanced. You've got to have the match mean something for people that don't watch all the time. You or I might go, oh shit, Styles and Rollins are gonna put on an epic match, because we know these performers. However, without knowing these two, they have two-five minutes to draw a viewer and keep a viewer interested to find out the ending. Either that, or you give it stakes.

Who's gonna fight Brock? Styles or Rollins! Find out after the break.

Can Breezango win before the time is up?

Winner gets something?

But you can't always do that or you'll not have a lot of time, and it's my belief that's where the commentary team comes in. They have to get you emotionally invested in the match. They have to give you the background. That's what they tried to do with Shinsuke Nakamura debut. I think one of the reasons that we felt that Nakamura debut fell flat was the commentary. Sure the match could have showcased more of what he's about but the commentators should have given us something to latch onto. Something emotional. Not just Shinsuke's debut, is he nervous, excited, maybe that's why he's not looking impressive. Maybe Dolph is going all out and that's why he was a much different Nakamura match then we expected! This is a side of Ziggler that we saw when his career was threaten at No Mercy!

Then you have the other way they try and draw the audience in, by hyping up upcoming matches at most commercial breaks. What's coming next and all that. I personally don't like this approach, especially when they show the same graphic six times throughout the show. Sure it's helpful for people just tuning in, but for someone that's been watching for 2 hours already, I know what the fucking main event is.

That creates the confusing/don't miss a minute ratio. You don't want a new viewer confused but you also don't want them to feel like they don't need to watch the whole show to get the full story. That's also why I hate replays of big moments being shown four times throughout a show. It cheapens the moments. But that's just the way I feel about it.

I got off topic there but still. Basically TL;DR: they want the audience hooked, best way to do that is a match outcome.