haughtney, it boils down to the fact that quite often I'm more than busy enough dealing with the traffic I have right now. I don't have time to go searching for aircraft 30 minutes outside my airspace. On many routes the first time I'll even bother looking at you is just before you call - not because I'm lazy or uncaring but because my priority is separation. If you aren't conflicting with anyone I can safely ignore you for now and deal with separating someone else.
Half the time I don't even have a coord line to the sector you're in 30 minutes prior to my airspace.