Aight, tricks are basically just kills in pvp.
Only do a trick when you have 100ep as it increases the value of the items that can be dropped, so you get more loot.
The person giving you a trick must be be risking 1 item over 76k (members).
If the person eats and attacks you back i find it can sometimes give better drops as it simulates a real fight.
I cant remember how long it takes to gain ep. But i think its 4 hours to get 100.
Once you have done a trick with someone, you cannot do a trick again for a minimum of 4 hours (i think it is). Although to be safe have a day inbetween.
If you're the trick seller, you dont make alot of cash and you make no $$$.
Although if your the trick buyer, you spend very little to possible gain millions in one drop.
Hope this helps.