Some questions regarding Site Flipping

I'm pretty much interested in this after years of experience in Content. Got a few investors who are ready for a trial run. As far as I have seen from clients, they usually used to buy a bunch of articles and put them on site, optimized them on a regular basis and waited for 3-4 months to get a direction while uploading more. The question from the investors are very valid, how are we gonna profit- even if it's from the exit? I prefer Buy Grow Flip model and even for that:

Let's say we buy a site making 50$ a month for 1500$. We put in contents every month, links and SEO for next 6 months. Even if we spend 1000$ in content SEO and all, how are we gonna profit? Like it will be having 2500$ in investment and we may be, at best get 800$ in revenue? And valuation just increases?

Can anyone just breakdown it in a simple form?

What is the model with Buy-Grow-Flip and Build-Grow-Flip?

In both models, the key to profitability lies in the ability to increase the website's value through strategic investments in content quality, SEO optimization, and user engagement. While the initial investment may seem significant, the potential for profit arises from the increased revenue and the higher valuation of the website upon sale. It's essential to carefully analyze the market, identify growth opportunities, and execute effective strategies to maximize returns.