just find the rules of supply and demand and be patient
For example, plat sale(double odds) --->more locked will be opened--->lock price rise--->elix and ankh price down, so u can buy elix and ankh in plat sale, and sell after, and buy lock before those event and sell in the event.

For this special event, price of exclusive items will be high at beginning , then drop fast...and then rise slowly ...then rise fast right b4 the end of the event...then drop fast after the end of event...then rise slowly and finally will be more valuable then the price in the event if u r patient enough.