Topsite Cheater? Advice Please

[oast]

I'm not a prolific poster in these parts, as I am usually able to sort things out myself, but this one is a bit more complexing... to me at least...

I have these figures for one site in my topsites referral stats

1 - No Referrer - 143
2 - http://www.domain.com/index.html - 67
3 - http://www.domain.com/ - 49
4 - http://domain.com/index.html - 8
5 - http://www.othersite.com/links.html - 1

The 'othersite' I am not worried about, because I don't stipulate all 'votes' must come from the same place.

It's the 'No Referer' that I want advice about.
Can I assume that the guy has 'voted' for his own site via a bookmark 143 times; or could there be another reason for that many "No Referers"?

This is in the course of a week. I have cookie protection, but we all know they can be deleted before accessing again.

I was thinking of not counting any votes that didn't specify a referer, but wanted advice from the board first, in case I would be eliminating some legitimate voters.

TIA

Steve