Do you focus more on winning picks, or on finding good value?
In my experience in sports betting, I admit that placing a bet on a low odds team certainly has a big chance of winning, of course, as you said, if you lose once in a match with high odds, if you do the calculations it will actually be a loss, not more profit.
Honestly, if I place a sports bet, I generally place the bet based on my own values and instincts, not guidelines on small or large odds.
For example: the match between South Korea vs. Czech Republic, the odds offered by the bookie are 2.40 x 2.20, if I focus on low odds of course I will lose, for that reason I weigh my own worth when placing a bet.