It's taken me two MLB the Show cycles (18 & 19) to finally understand how to make stubs in the market. I invested about 300k into the market, which brought my stub total down to 125k. I then had to sit on my investments for a few weeks, but yesterday I finally cashed out at 605k (minus the 125k and my return was 180k)!
I then splurged on some players to make a run in Ranked Seasons as I sit at 740. Welcome to the team Mike Trout, Chipper Jones, Shane Victorino, and Aroldis Chapman! Now I sit with 93k stubs in my account lol