Well I am also guilty of that, in my first playthrough I went along with the plan cause I wanted those sweet sweet Katie points. But I didn't expect it to turn out that way, I figured the plan was to distract Natasha while Katie 'deals' with Roger. But then the MC picked up the camera and went all in, in every sense of that term.
I have never chosen that option again in my countless successive playthroughs. And I lost respect for Katie because of that. Though I don't think even she expected it to go that far and actually felt bad about it afterwards. And the MC being the high functioning sociopath that he is, was also able to replicate some emotions resembling guilt.
I guess I had it easy because I wasn't all that fond of Katie in the first place and the over-the-top scheme just reinforced that belief. So I stormed out of the basement rather than stay with Natasha. Katie was initially pissed, but too bad for her. Still, Katie had been treated badly by them so I didn't want to twist the knife. I told Lily and Debbie the plan lacked class and called it a night, figuring the chaos the evening would generate between Natasha and Roger was good enough.
Surprisingly, by the time we left the party even Katie was admitting it was better not to go through with the plan, so it seemed like I had blundered into the sneaky best move. When I went back and saw the how the full revenge plan went down I was certain I'd made the right choice, and I've never really looked back since. In subsequent playthroughs I always call it off early, even when courting Katie. At some point I'll probably do an 'asshole' run where I take all the choices I normally skip, but I'm in no hurry thanks to the quick-start option.
This did lead to a little confusion, though, when everyone was talking about the blackmailer at the end of Episode 21 and I had no clue what they were on about.