No, not mad if you have the resources and the spark to do the trips while you can.
I worry about myself when I have deposits on more than one trip at a time -- compartmentalizing and separate files are key.
I must say that I do admire that you planned your next trip after JUST being back from your last one. After each long, overseas flight I always swear I will NEVER do that again (but then, months later when travel catalogs arrive, I cave). Maybe that's why I take the dual trip planning approach -- commit before reminding oneself how much those long flights are disliked :o
Enjoy your travels -- you could be up to much worse :) But, we have to assume your wife also enjoys traveling?? If not, she may truly think you are mad (not understanding the pull).