@milenss you might be trolling but I like talking about this stuff so I'm gonna proceed with this.....
-133 doesn't mean you have to bet $100 to win $133. It means you have to bet $133 to win $100.
If you do as
@Mebetter said you'd bet $366 total. If Jones wins, you return $200 profit plus the $266 you bet = $466 = $100 profit overall. If Gustafsson wins, you return $310 profit plus the $100 you bet = $410 = $44 profit overall. That's a guaranteed ROI of at least 12% (if Gus wins), which is extremely good, and a potential ROI of 27% (if Jones wins), which is obviously even better.
This type of betting is called arbitrage betting, where you play both sides to guarantee profit. These situations can be easily spotted by looking for lines where the underdog is a bigger underdog than the favorite is a favorite, in moneyline odds. E.g. Underdog Gustafsson's 310 is much bigger than favorite Jones's 133, which is why you can guarantee such stupidly high profits as shown above, and also why this particular line would never exist. An example of a real arb bet currently exists for Mendes/Volkanovski, albeit barely; you can get Mendes @ -142 @ BookMaker and Volk @ +143 @ SportBet.
In arb betting, you can calculate the correct amount to bet to weigh the profits how you'd like depending on which fighter wins.
For example, let's say you have $1000 to bet. If you wanna play it straight down the middle and win the same amount no matter who wins, you'd bet $700.63 on Jones and $299.37 on Gustafsson; no matter who wins, you'd profit £227.42. Alternatively, let's say you think Jones wins, but wanna break even if Gus wins; you'd bet $756.10 on Jones and $243.90 on Gustafsson, breaking even if Gus wins, but winning £324.59 if Jones wins. Or let's go the other way -- you think Gus wins but wanna break even if Jones wins; you'd bet $570.82 on Jones and $429.18 on Gustafsson, breaking even if Jones wins, but winning $759.66 if Gustafsson wins. Finally, you could go somewhere in between these limits if you want, to weight the profits how you'd like.