I'm careful what I toss now. Here is one from a game still early. Mare was a cheap broodmare sale buy. A handicap winner who's best foal so far had been a filly rated in the 90s which won only one of their races: a novice. I used a game standing sire who was just a single G2 winner, but had a couple of other G2/G3 placings and had a good winner production, and a couple of G2 winning foals from not very many mares. I wasn't expecting much but something to sell to buy a better mare/higher stud fees.
The potential was just under 50% at 2. It is what you see now at 4.
It took me a while to realize she needed 2-4f longer than either parent. And that even though her going preference is soft, she's fine on good to firm or even firm. Put her a G3 when her rating squeaked over 100, barely. Imagine my surprise. And since did well in Dubai, oh why not the Gold Cup. Could have scraped me off the floor.
Doubt I'll get a G1 on her at 5, but may get some more G2s I think. Yeats is out there and must be avoided.
When doubt now, I race, then toss.