I think there's a big difference between floating a number like "2X" to entice someone into an interview, then presenting an offer for "X"... versus just floating "X" in the first place, and maybe someone is too timid or unaware to ask for more.

Honestly, we're not SKU's. Once you get some experience, the main difference between, say, a $100k developer and a $150k developer is that the latter simply decides that's their price and interviews longer until they find it.