If it was money, and it all disappears when you make it go away, then that would probably bite you in the butt eventually. When you pay off the loan sharks, and then minutes later the money vanishes, they'll think you're tryin' ta dupe 'em, and they'll return to your place of residence and rip you a new one.
Also, if it was some sort of food item, you would only be able to consume it once every few days or so, if not weeks. Because any nourishment you would attain from it would vanish, should you wish to consume it again. But I guess it could be a cookie or something, then you could enjoy it over and over, never get full, never corrode your teeth, never get fat/unhealthy. Yeah. That'd be great. I'd want to spawn a can of whipped cream.