My tuppence worth... I lack the confidence to write a formula and "just know" that it's correct (damn fiddly commas). I like to see it work. So I usually ask for a sheet to be attached or (if it's simple) do it myself. If one or two formulae are required - I'll put them in the post and in an uploaded sheet, if it's more than that, I'll usually refer the user to the sheet.
In addition many answers simply make NO sense unless you know what's in J3 and F4 and Q1110, etc. Additionally, I'll often offer little explanation until it's working to the OPs satisfaction and then I'll spend time explaining it. Until it's clear what the OP wants and how he/she wants it to be laid out, I don't see the point in providing detailed explanations.
Horses for courses.
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