I have seen most people who pay money for the bet just because someone informed them about the game, I will be like... Wow, why will you bet on a game you have no knowledge about and funny enough they will end up not winning the game. People intend to stake more games and analysising multiple games at the same time is stressful so you might not have an assurance about the game also. Even with the idea gambling is said to be a lucky game so staking multiple games can still give you more chance of winning under probability, I just focus on the money spent and I make sure I will not gamble and forget my limit
It's no longer news that there's a great deal of danger when someone gambles without proper knowledge or research about the game or gambling at large. It's true that a lot people have been swayed by others people's tips or advice without taking out time to do their own research. And you're right when you said, trying to analyze multiple games or options all at once can be really difficult and is liable to lead to mistake or raises your chances of losing.
But no matter what method a gambler chooses to employ, it's important to always stick to you limits and budget just as you pointed out.