Can rental sites spam search engines inadvertently?

[Mountain Goat]

Another routine check on Google, using a couple of unique keywords from our publicity copy (and then the name of the property - slightly unusual), resulted in over 200 returns for one of our pages on a listing site. Which was nice.

Or ludicrous? Or dubious?

When using Google in this way (a slightly pointless theoretical exercise I admit) does it get these results by inserting the keywords in every possible way into the rental site's internal search engine? (plus ticking the site's boxes for ski property, mountain property, rural etc, no. of bedrooms etc.).

Can overenthusiastic SE optimisers go too far, wth possibly negative results?

Same two keywords returned 134 on Yahoo, 11 on MSN (producing obscure Italian sites with no known connecxtion to us), Altavista 136 (there's a clue), Dogpile 32 (most of them hidden sponsored results).