Three questions for yourself on every occasion when ordering or buying champagne....

To what extent do I plan to impress those for whom I'm buying?

How acute/astute/informed are their palates?

Just as I may be seen as an under-buying cheapskate, may my purchase brand me as a profligate wastrel (or an employee blowing the company's money on gross excess)?

$300 Champers is like unto $1000 call girls. Does the quality of what is received emerge as three times better than a one costing a third as much? For champagne and call girls, the price is often related to the venue. You'll often be overcharged for bubbly in the same joint where the other commodity is vastly over-priced and generally over-rated.

The lesson is simple. Unless you or he/she with whom you'll drink it know to appreciate the champagne for some reason other than the price or the label, it's too expensive on which to spend your or your employer's money.