>Copyright is, as in many things, a "use it or lose it" kind of situation. Unfortunate, but true.

I don't believe this is true to any degree. True for trademarks [1] but not for copyright. The copyright holder is completely within their rights to turn a blind eye to the first 99 infringements and then sue for the 100th.

[1] http://en.wikipedia.org/wiki/Trademark_dilution