Reading here, sellers complain about noobs and tire-kickers, often explaining that if the person has a trainer on board, that somehow "pre qualifies" them as a serious buyer.
IME, sellers haven't asked me for this. Maybe they know from the first conversation that I'm serious and that's why I'm being pro-active in buying the right horse for me with my money. Or perhaps they learn that I'm not an idiot when I ask them to ride their horse before I get on it. I don't know.
But I do think that the Serious Sellers or Serious Agents like the buyer's trainer let the person with the money check out the horsey merchandise in the way they want. The gamers want to separate the Wallet Holder from the decision a little more. JMHO.