Who should really be investigated by the IRS is H&R Block for charging a few hundred bucks to fill out a 1040EZ, the bastards.
I've had "clients" that griped about my fees, and took their business to H&R or one of the other services. Most of the time, they came back the following year.
When I get a call from a referral, I tell them my average cost ranges up to $150, based on time, not # of forms. If they have SE income, I tell them it can run beyond that, because you're dealing with home office, vehicle, and other business expenses.
If I see they've had a tough year financially, I add a pretty hefty "parish discount" to the return. I do these returns as an aside, so I merely look to be compensated for my time and supplies.
My costs have decreased thanks to switching from Turbo Tax. Their annual license fees ($300-$400) are pernicious, and I know use TaxAct. It may not have all the forms, and bells & whistles, but it handles 99.5% of what I need.