Because I'm lucky if my combined appointment and waiting time take only an hour. Because where I live, PCPs are booked out 3 weeks. Because the last time I went in for a tweaked muscle in my back hoping for a shot of toradol, I walked out with orders for X-rays and an MRI, 6 months of physical therapy, a referral to a pain management specialist, and notes on my chart that ended up giving my insurance a reason to refuse to pay for a surgery that 3 other doctors had agreed that I needed. (I eventually got the toradol, and was right as rain in 3 days).
I'll stick with the KISS rule.