In Creative field/job one never gets boredom?

i have seen several ppl enjoy doing their world in creative fields such as cinema,ad films,advertising,fashion designing,photography etc…why is it so?and also at the same time creative field is quite riskier than a regular 15k salary job…as anytime he would be blank without ideas and depressed…views welcome…which creative is good?

look vikram , nobody can control someones passion , some people enjoy doing a particular work , though it is risky but they find happiness in doing it , take my example , i have taken degree from IIT delhi , leave a job in very big MNC and start working in stock market and you know what i find happiness in myself when i work in market and market is also quite risky as you himself know.