Yes on both counts. I use Greko for conventions, although you can still buy copies of your book (discounted) from KDP.
If I remember when I priced it out for my first book, KDP wasn't a good price on color books until you went above the minimum number of pages (they are perfect bound). So like for a 24 page comic the price wasn't great. But I think it would be great for a trade paperback or graphic novel.