Using that method, you will be broke in no time. This past NHL season, I had a time where I went like 4-16 in a 20 game set. It was absolutely horrific. Granted, I was betting dogs only, but if I were to have had my unit size set at 10% or 7.5% or even 5%, I would have depleted my bankroll completely or to 25% or so from where it started. Since I was only betting around 1% on each bet, it wasn't a problem and I was still around a month later when I won 15 of 17 bets in the NHL.
Sports betting is a roller coaster, which is exactly why money management should always be your top priority.
I must admit this was my own reaction when I first saw SAWYER's recommended percentages v bankroll
For the past couple months I've been using about 5% of my bank per wager, but they're nearly all 2TeamParlays with avg +money on each selection. And I've had a decent eye and am winning about three for every ten placed.
So while I might lose 7 Units, the 3 winners pay a bit over 3x1 and I've yet to be overly exposed. Were I betting Straights, I'd counsel strongly to not top 2% per wager