I'm sure Walmart's online sales are a big success (something like 350-400m sales?) but the vast majority of shoppers go to the physical brick-and-mortar stores, which are damn near everywhere. The cues are not being sold in the physical stores. Therefore, only a small fraction of walmart shoppers are seeing these cues.
On top of that, try a search for cue, pool cue, and pool stick at walmart.com. Good luck finding the schon. You see about a million results for cases, a million results for cuetec, viper, and 'trademark global' [lol]. You might see 2 results from mcdermott. You will need to fish awfully hard for Schon.
So even among the limited number of shoppers browsing walmart's site for a pool cue, almost NONE of them are going to keep searching through 5 pages of results to finally see the Schon.
Basically this is a complete non-issue. I would be surprised if Schon sales saw a huge bump because of this.
I was able to find them quite easily by clicking the following tabs (from the Wal Mart home page): Sports and Fitness -- Game Room -- Billiards -- Pool Cues -- Sort by: Price High to Low.
Or, you can just search the word "Schon" and they come up. Also, did you guys know they're selling Predator shafts online as well? Crazy.