It is not that expensive. It costs ~30$/year.
Yes. Actually, using namecheap, it only cost 23$ per annum, SSL included. And a bit more USD, for other expenses. So it might take up to ~40$ per year.
Yes but if you're seriously considering the name, you should register it right away (
$12.98 for the domain) before it get parked since you've mentioned the domain name already.
It will be troublesome if someone registered it before getting an answer to this topic, you can just sell the domain if it happened that you're not free to use "
bitcointalk" anyways.