There's the opposite argument to yours though. "I bought a skid plate and never needed it". I find posts amusing when people have to justify their purchases. Who cares? buy it or don't. I didn't buy a diesel truck to tow 12k lb trailers. I could though if I wanted to.
To each their own. Spend your dough on what you want. I opted for a hybrid pan over a skid plate. It will dent the steel before it would crack the aluminum unless it was extremely severe impact. In the case of severity, your alloy skid plate would fail and push up into your oil pan, cracking it anyway. It's all situational. If it brings peace of mind and it's well worth it to the end user, party on!