The ave. home team is -120 or so. That's betting 1.2 units to win 1 unit. If a road team like the Astros wins 5 in a row (and we keep losing our bets), the 6th game will look like this:

Bet 60.66 units to win 50.55 units.

Your unit size better be tiny. That's one bet out of perhaps a dozen that you may be trying to get down on.