I just bought the game yesterday and played around 4 hours. Here is my suggestion:

I recommend you use a Paypal Donate button next time you need money to complete a game. I would happily give you a bit of cash to finish the game instead of selling me a few maps and one game mode for 19 GBP!
My time is precious and I never participate in Beta's. Please don't force me to.

Thinking of it, I would rather you send me a student knocking on my door at 7pm requesting a donation for a UK based company that needs a bit of cash instead of wasting my time.

Have you heard of the DLC?

We all know no one would donate.

Call of Duty doesn't have a donate button, but everyone's been pouring money into it, and they haven't tried to make any new advances in years.

BRINK's all about new advances.