Because it beats getting absolutely 0 pvssy busting nuts on your own stomach watching porn like a non entity.I imagine that you will spent 3-5 hrs/week for banging this chick. You can use this time to develop a hobby or sharpen your skills that will refresh your mind, release your tension, and overall leave you in a better place.
Why would you do something that you need to forget afterwards? Doesn't sound like it's enjoyable.
I’ve never had to resort to banging 3s and I haven’t had a drought longer than 2 months since 2014/2015 season so I’m just giving my opinion here. Being an incel equally isn’t good for mental health, rather bang a 3 than be an incel. Beggars can’t be choosers etc.