== OMwF == 

 :(There is no objective criterion for adding quotes.) 
 :Yes, there is. Quotes ought to be ilustrative of the topic in question. "What else would I pump you for" is neither relevant to the episode, nor particularly specific to Buffy. The two you've added, however, are much more appropriate: a small joke refering to the state of things, and a (rare, if not the only, in the show...?) instance of fourth-wall-breaking that refers to the series' schedule. 
 :So, as I see it at least: putting up random jokes and fan favourites = t3h suck; putting up quotes that either reveal something of significance about the characters, story archs, or are simply distinguishable for one trait or other = t3h gr34t. 
 :Am I very wrong? Cheers,   

 It's still subjective — you yourself say "as I see it". But I happen to agree with your criteria for Wikipedia use. (That's why I didn't restore the "pump you" quote.) Perhaps we can encourage fans to add other quotes to Wikiquote, where fan favorites are welcomed. ~