Not necessarily. When a seller pulls an ad, sometimes it is because they have learned that their item for sale is far more valuable than they originally thought it was, and their ad will return with a much higher price. Or they have discovered they need to raise the price to make negotiations easier on their end. They may even retreat to ebay to maximize the return. Especially if their phone was ringing off the hook, they know they may have a hot item.

I have on numerous occasions raised the price when I thought it would help me get more dollars for an item. I successfully did it on my vintage 76 Honda M/C, I did it on a 65 Chevy wagon, a '71 Pontiac Trans Am, and I've even done it on a home.

If a seller's goal is to get as much as they can out of an item, versus moving it quickly, then changing the price of an item or taking it off the market briefly, can reset the price of an item in any potential buyer's mind.
When you come upon a repeat interested buyer, that sees you raised the price - this plays havoc with their mind. They cannot get the old lower price out of their minds. When a buyer was trying to chisel a few thousand dollars on my home I had for sale and I had negotiated down in orice twice - they said they could not pay it. I told them I was happy they weren't interested, because I was raising the price by $27K the next day. I received a call within 20 minutes that they would buy the home, dropping ALL contingencies, if I would still sell at the negotiated price. I did, but I regret being played that way by them, when I really wanted to raise the price by $27K as I said I was going to. I kind of wish I still owned that home.....

Sometimes a seller will choose to not do business with certain potential buyers if they feel the buyer is trying to chisel or hemming and hawing with them, and they don't want to fool with someone balking or trying to steal the item. That may be why he won't communicate with you - I don't know.

You gave no asking price, even after I asked what the asking price was, so I am operating in the dark on this, but the price may have been low enough that it got scooped-up while you were mulling it over. If this was a case of hemming and hawing on your part when presented with good merchandise at a good price, then you lost out.

That's happened to all of us - sometimes for the best, by the way. We find something we like better later on - that's what happened when I bought my last diesel motorcoach. I found a terrific coach that I didn't like because it had dual leather sofa's versus what I wanted, one sofa, and two captain's chairs / table combination. I later found the same brand coach, with the same diesel power, with half the miles with the floorplan that I really wanted a few weeks later.

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'06 E320 CDI
'17 Corvette Stingray Vert