It's pretty obvious when you are playing fantasy tournaments that you need to figure out where your money is going.
How much rake are you paying? (If there's an overlay, sometimes none.)
When you become experienced enough to actually compete for the top prize in a tourney, you also need to consider the potential reward for what you are spending.
In other words, How much return (ROI) can you get for your entry fee(s)?
The easiest way to measure this is buy-ins.
Here's a quick example. the $3k Fan Duel baseball tourney has a $25 buy-in and a top prize of $750. Therefore the max buy-ins I can win off one entry is $750/$25 = 30 buy-ins.
Now let's move on to NFL which has a much bigger user base. The $1, $2 & $5 tourneys they run (and fill) each week offer a top prize return of 350 BUY-INS.
That's an amazing value. If you're just starting out, playing these cheap tourneys multiple times would probably be the best way to grow your bankroll.
Let's compare this return to the largest multi-entry Fan Duel NFL tourneys:
The $535 pays out $7,500 for 1st, a return of 14.01 buy-ins.
The $100 pays out $5,000 for 1st, a return of 50 buy-ins. (In this tourney you are paying the SAME RAKE as the small tourneys!)
And consider this about the FFFC: If you entered the $270 qualifier that didn't fill, you played with no rake. However, even if you made the final and finished 3rd for $25k... You still made less than 93 buy-ins on your investment.