If it’s not for you, and you’re comfortable leaving money and opportunities on the table, you do you. Everyone has to do what’s best for themselves.
If you’re happy in your current role and just looking for the perfect situation to move to, there’s nearly no prep needed for the first interview (assuming the technical/coding interview comes later int he process). Just grill the person who’s interviewing you and get the info you want.
There are all sorts of things you can do to get the money and opportunities that don't involve perpetual interviewing.
You don't have to be introvert to not like sort of police interrogation.
I do agree with you that money and opportunities can be had without perpetual interviewing. The goal is to increase the number of dice rolls to maximize your chances of success. If you can do so without interviewing constantly, absolutely! Do it! But if you're comfortable constantly exploring work opportunities, and you have the time, I recommend doing so.
[1] https://www.pon.harvard.edu/daily/negotiation-skills-daily/e... ("Your best alternative to a negotiated agreement, or BATNA, is often your best source of bargaining power. By cultivating a strong outside alternative, you gain the power you need to walk away from an unappealing deal.")
(While we're here, here are two great resources on salary negotiations as well [2] [3])
[2] http://www.kalzumeus.com/2012/01/23/salary-negotiation/ (patio11 on salary negotiation)
[3] https://news.ycombinator.com/submitted?id=JoshDoody (Josh Doody, whom I have no affiliation with, has tons of quality material on negotiating roles and comp in general)
But as interview is interrogation, its unpleasant and its doubtful how much do you learn about opportunities or how high is your chances of success with taking into account lost time and energy. Making it perpetual sounds like a horror to me, and that is true for me even from the position of power. I'll rather go different route any time if possible.