Virgin Galactic just sold tickets on its orbital flights at the highest prices ever. Shares of Virgin Galactic (SPCE 6.75%) have fallen about 90% during the past year, tumbling from a high of $65 a share to less than $7. The space stock enjoyed a bit of a bounce after the company on Aug. 7 delivered better-than-expected revenue results for the second quarter. But since then, the stock has retreated. Why is that? From $250,000 to infinity, and beyond It wasn't exactly "infinity." But the biggest single surpr ...