[Spitty]

That's a solution of last resort.

You have to devote a lot of time to whitelist maintenance and adhere to an acceptable SLA, or alienate everyone on dynamic or those who play from hotels, cafes, etc.

I'll take the occasional pingout over logging on, finding out my IP has switched, submitting an IP update request, waiting for a response, trying again, finding out my IP has switched yet again, submitting another request, etc.