Cookbook Question

I have a cookbook question for anybody interested.  I have another 450 plus recipes that I that perfected, organized, and gotten ready to be published.  I don't want to make the investment unless I feel that I can sell them (you know how things are now with the economy).  My question..... do you think it would be worth it?  I sold 1000 copies of the first one...and am not sure about publishing the second...  I need your advice!!!!  THANKS!!!!!!