Oh wow! I have actually wishlisted the Day/Night cycle asset pack, so yes if you want to give me a key for it sure! I don't know if I'll use it for this project, but I have other projects in my mind that could benefit from it!
And there's no reason to be sorry about adding prices to your assets, I think you could even bump them up a bit! I gave you a lil shout-out on Twitter too so hopefully more people will find your asset packs :D
I will keep you posted on my progress, but since I'm busy with studying/internship etc. things it's been tad slow lately.. :'D
Cheers! :)