You may not, but thats how its coming across. We had donations to cover another years web hosting, which we did. These ads are to generate a small amount of revenue for myself personally, I'm a University student who could do with an extra £20 to cover a weeks groceries. Besides it makes no difference to you, it's not charging you, it's of very little convenience and with 1000 downloads in less than 24 hours its a great way to get a little back. It's also permitted so yeah there's your explanation now back to topic.