Her initial cost starts out higher than some of the early Campus girls, but at Lv. Helen is easily the cheapest girl in the game overall. By Lv 10,000, only Helen and Sally are still in the Qs. Almost all of the girls start needing NONs, after a few thousand levels.
The early levels aren't really a problem here: it's the later levels that really cut into your WP. The Skip Button charges a certain amount extra, depending on how many levels you're trying to skip.
