You are a machine!

___________________REALTOR® CalDRE: 02221003 | CA Bar: 322013

@Anson Young taught me about the Short Sale Time Machine... which I'm currently riding right now :)

For the same or similar reason you doubt the effectiveness of YellowLetters for Realtors® is why it would attract a positive response from some recipients. 

ESPECIALLY if you have a brand like the enormous brand of WeBuyHouses®.  

It is one of the things I like about the We Buy Houses® System....

A notice is taken to be received:i.in the case of a notice delivered by hand, when so delivered;ii.in the case of a notice sent by pre paid post, on the third day after the date of posting;iii.in the case of a notice sent by facsimile, upon the receipt by the sender of a transmission report from the dispatching facsimile machine which confirms that the facsimile has been successfully sent; oriv.in the case of a notice sent by email, upon the receipt by the sender of a confirmation from the recipient or the recipient's email server that the email has been received by the recipient.b.If any provision of this Agreement is judged invalid or unenforceable for any reason whatsoever by a court of competent jurisdiction, such invalidity or unenforceability (unless deletion of such provision would materially adversely affect one of the parties) will not affect the operation or interpretation of any other provision of this Agreement to the intent that the invalid or unenforceable provision will be treated as severed from this Agreement.c.This agreement is governed by, and must be construed in accordance with, the laws of the State of Victoria, Australia and the parties irrevocably submit to the exclusive jurisdiction of the courts of the State of Victoria, Australia and their Courts of Appeal.

If only comparing Name Recognition only I can say "we Buy Houses®" would win hands down...When I used the trademark I Buy Houses Ugly Ones Too!

It's like plugging into that machine from the Matrix to learn Jiu Jitsu (only you learn about real estate investing). 

Or put in a Hepa filter machine in there for a few days and see if that can get rid of it?