We all know that sell offs happen at some point, but no one consistently knows in advance at what price level a sell off will stop. You say FCEL's will stop at $7, but if it stops at $10 (or $11, or some other price above $7) and then resumes going up (without ever dropping to $7), you miss out by waiting for a drop to $7. In the long run the USA stock market moves up, thus waiting for FCEL to drop to a specific price involves a large opportunity cost risk (if FCEL continues to have a long-term uptrend, and the evidence is it will continue to have such a long-term trend for months and years).
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