I recently completed the map. I used up a large portion of my savings on it, but then, I was not spending it on anything else. Between daily events, shop sales, etc, I am making back my money. Was it worth it for me? I am having a blast with it, I have gained and lost, changed color and now species in a matter of playing with it a week. So far it has really entertained me because its something new to look forward to every day.
My advice, which was gained through many people here, use the shop wizard. The trading post will run you 700k plus for a complete map. If you are dilligent, and don't mind going cross eyed, you can save a lot of money. All told I think I put my map together for under 500k by using the wizard and having a little patience to find the right price.
An extra plus... you can then use the Petpet lab and that map is significantly easier to obtain.
Hope that helps!