C.D.
Hi S. - I have a very niche line of greeting cards so i might not be your best reference, but I have certainly learned a lot about the card business since launching my collection back in 2006 at the National Stationery Show in New York. If you want to do this because it is something you enjoy, I say go for it. If you want to do it because you think you can make a lot of money, run fast :-). There is a yahoo goup called Greeting Card professionals you can join and Doug Ready has a great guide you can reference there too. Good luck, and if you have any other questions, feel free to let me know.
Have an "uplifting" day,
C.
PS - you can see my line at www.liftmeupcards.com. It was just featured on NBC and in D Beauty Magazine, as well as in Redbook, WWD and others.