You need some amount of data before people finds this interesting and starts to use your programs to add stuff. But to get that data, you need already people to input it. "chicken & egg" problem.
They have a WebService (XML-RPC): http://www.upcdatabase.com/xmlrpc.asp
They even give sample code for C#.
Unless you start charging for your program, you should be fine. What's the purpose of having a Web-based product DB if it cannot be interrogated?
EDIT: you could also download the dumps of their DB and insert it into yours. So you would not rely on their webservices but still have a nice prepopulated DB. You would of course have to update your DB once in a while (1 dump every month apparently).
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