Ok let's get technical here? No I won't go against the rules. I'm sure every mod here will tell me this is not rare. So wait for a moderator to change my title/PM me about this first instead of trying to be one yourself.
Meaning of rare: marked by unusual quality, merit, or appeal : distinctive
Yes it may have numbers in it making it not rare to sythe's terms. But due to the new 2007 version, it goes great with that definition. You have runescape and 2007 scape/osrs right now. Had runescapes original game-name been 2007 scape I ensure they'd update that thread like so:
7. Any Account With Numbers In Them - Examples: “Coolkid224” “Owner353” Not rare at all. It has extra characters in it that aren't necessary or replacing vowels. It's only rare is if the name is repeated with the same number ie: 1111. Unless the account is "2007scape" or "2007 scape" this would be considered rare