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If it's a $400 fountain pen and not a 144mBTC fountain pen, then I think you are thinking about the current price of bitcoin ;)

I'm assuming you're placing your ad in USD and converting to BTC for the transaction, instead of listing a BTC price.

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Many finance publications use USD regardless of their country of origin. Financial Times, a UK-based company, regularly lists valuations with USD equivalent. Does that invalidate the GBP or EUR as real currencies? The market cap of USD is over 1.5 trillion. The market cap of bitcoin is $45b USD. It's more than sensical to display equivalent conversions.

An instrument can be a useful tool for value transfer and storage, without being that useful for pricing.

There are however some people that price their "services" in BTC, most notably ransomware criminals. I think also bets are quite often valued in BTC.

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