i would like to know why there are so many tricks that are on the market that all in the end achive the same effect? i mean not even just cards there are 3 popular coin thru bottle effects i can think of off my head and then 3 cap thru beer bottle effects too. i just wanna know why more than one way to do an effect is out there because to a laymen they look like u put the coin thru the bottle or u put the cap thru the glass bottle either way so why not just have one of each?