Pumps are games people play. Most people are just having fun, chasing possibilities 
Rarity mint gambling is an interesting slightly different dynamic, since it’s a hybrid of gambling odds and pumping. People like to gamble, especially when the downside appears low. 

Some people simply decide it’s not their choice to participate or to serve that market. There are multiple reasons why they might decide that. 
It’s not necessarily that people don’t understand that market