UPDATE: This is way more than normal, seems like a coordinated attack, I've informed a mod who will likely inform the StackExchange folks, please keep flagging until you can't flag no more!
There's no need to worry, between you and the other amazing community contributors your personal limit doesn't really matter, there's enough people flagging to make spamming Ask Ubuntu a waste of time for most people.
Just do the right thing as often as you can, and when you hit your personal limit, trust that the rest of community has your back! RightCollectively we're way faster than any spammer. Right now each spam post has been on the site for less than a minute each, just keep rocking!