I'm no expert, and I think sometimes I appraise too low - but yes, the reason I wouldn't spend big bucks on phonenr.com is because of the nr. If you had to tell someone the domain, there's problems. You'd say "phone en ar dot com - which stands for phonenumber.com". I dunno - it just seems like it could be easily forgotten/confused.
As for fullspray and loadfrom - my issue is having no idea what they have to do with. Fullspray has better hope than loadfrom, though. Just not clear what either could be used for.