The new Lolth planeswalker is a tricky one, as it's quite costly at five mana, and its ultimate ability isn't too strong. Yes, you can activate it early on by sacrificing your creature tokens, but these types of decks usually don't run cards that cost more than three to four mana.
This puts Lolth in a rather narrow situation, where it can be considered only for commander decks, albeit not in a role of a commander. Currently, it is being added to many Chatterfang, Squirrel General lists.
All this makes Lolth a rather unpopular choice for investing, although it does get the compulsory $20 planeswalker price tag.