Yes its good to have a plan to stick to so you know when to walk away.
Another good Big Bet Strategy is to split your bankroll in 2 but always should try and bet big, and bet min amount of times to reduce exposure to the house edge:
Split your $200 bankroll in 2 and make two bets on black for $100 each:
Scenario 1:Win first bet, Win second bet - Have $400 now - Walk Away!
Scenario 2:Win first bet, lose second bet - Have $200 now - Can try again or go home!
Scenario 3:lose first bet, Win second bet - Have $200 now - Can try again or go home!
Scenario 4:lose first bet, lose second bet - Have $0 now - C-ya!
With this strategy you will lose it all only 25% of the time (on a game with no edge).
But you will break even 50% of the time.
The Rest you will hit your target.