Donald, I have to disagree with what you did.
You should have, instead, compile the list of new sites into a different list and sell it. Rather than compiling your old list with the new to sell it to new customers. It doesn't make sense and it isn't fair to your old customers.
All scrapebox blog comment list are sold this way. They sell a totally different new list at a different price and cheaper price to existing customers.
EDIT:
Although you said you forgotten to compile it into a different list, that was YOUR mistake. How can you push your problem to your customers? Regardless, you should have done the right thing - either give the "mistaken" list for free or at a discount to your existing customers. You can't just make your problem everyone's problem.
But don't get me wrong, bro. It's your choice. And I'm not siding anyone (in fact, although I bought from you, I wouldn't care what's your next decision). Just keep in mind that your customers will have a very bad impression of you.
