[r38y]

I would say plan for some traffic you can afford, but know of someone that can help you out if you really get into trouble. It's along the lines of "worry about that problem when you have it, because that problem is a great one to have".

[danielha]

It's a great situation to be in, but it's not a great problem to have. Worry about this before you launch because turning away potential users isn't a goal.