That strategy you mentioned is somewhat similar to arbitrage it can also be done through live betting but when it comes to very low odds it's so difficult to break even since one of the two sides is usually juiced by the bookies so you're better off shopping for odds with a different bookie.
It do feels like you do really like to punch the wall due to frustration but well thats how gambling works where games arent that 100% precise on between winners and lossers.
Having low odds doesnt automatically means that they would win that certain fight or game but to have that common sense if its the heavily favorite then
bookies would normally be setting out those kind of odds.Its business afterall and they cant really just give out huge odds if they do know that they could
really be putting themselves on disadvantage.