A couple points here:
Most (probably 90%) of buyers will only buy one pack of a given line to test them out. People do NOT spend $100 for a pack of "award winning" beans, grow them out to find all losers, then decide, hey, let me spend ANOTHER $200-$300 looking for better phenos. It just doesn't happen that way. Instead, what happens is they cut their losses and start posting on the internet about how they got screwed and will never buy another overpriced bean from that company again. If your business strategy is to try and get people to pheno-chase your lines by buying multiple packs, you're probably not going to do well. If you put out crap that's supposed to be great, it will catch up to you sooner or later.
Doggies Nuts, apparently folded as a company, though poster Kona Gold said that one of the workers at Attitude seed bank told him that someone else picked up the name and is working the lines.
Without getting into a rant about it, I think the more sophisticated growers realize that the High Times cannabis cup is mostly about hype and doesn't necessarily represent the best genetics out there, let alone the "best" most suited to any individual grower.
Next point, contrary to popular misconception, plants grown from self-pollinated plants (ie S1 ceeds) ARE NOT genetically identical to the mother plant and most often WILL throw off different phenos. The only reliable exception to this is with true-breeding lines where all plants from that line put out similar phenos. So you can't just take an award winning individual plant, or "clone only" line, self it, and create ceeds that will grow into identical plants. It just doesn't happen that way. At *best* some of the plants you create this way may be similar to the parent, but depending on how hybridized the parent is, it may be precious few. . .only 1 in 100, or less. If it were that easy to replicate superior individual plants into ceed form, then there would be no such think as bad genetics. . .all beans would be awesome.
On F10s, there are plenty of ceeds out there like that, they're just not advertised as such. EG, most of the commercial Skunk, Northern Lights, landrace Afghanis, etc, are inbred this way. Sannie CALLs his Jack "Sannie's Jack F7"; that one is fairly inbred. You can buy a labelled Herijuana F19 from "Da Bean Co" if you like. As you say, most buyers simply don't know the difference between S1s, F1s, inbred lines, etc, to know why they should (or shouldn't) be looking for stuff like this.
IMO, if you're a personal grower working against small plant counts, stability
is VERY useful.