I have some ideas for iPad apps, but before I pay for the hardware and dev membership I was curious about something. Let's say I write an app that's different than what's out there, and let's further say that it's successful (sells). Is there anything stopping anyone from just copying what it does and just redeploying their version of it? Possibly with more developer clout, fancier graphics, etc? In general are there a bunch of wolves out there waiting to jump on bandwagons, or is there a way to keep something unique? TIA