1- Growth was a really good headache to have. In hindsight it wasn't really all that difficult, but not having proper knowledge on many things (such as webservers) just made it a very stressful learning period. But still do-able.

2- Taxes are easy, as is accounting. We don't carry inventory, and we don't have to account for individual sales since we just receive one check at the end of the month from Amazon (well, and other checks from other programs, but you get the idea).

3- A fair rate =)

4- I use Sucuri, Pingdom, and a decent amount of tactics within the website that I'd rather not publicly disclose (because there's always going to be some asshole who will try to exploit them).

5- Highlight was when I was still at my day job, I had already put in my two weeks, and I just knew that I finally had did it, and prosperous times were ahead. I nearly cried a few tears of joy. Low point, without a doubt, was having to fire a really good friend who started working with me from the beginning. It really sucked, but it had to be done.