That said: ballpark how many people work in this industry with decisionmaking authority on this. Ten thousand? A thousand? Let's call it one thousand. It is entirely possible that you are smarter than all one thousand of those people. They've devoted their careers to selling payroll services and success at selling payroll services determines whether their children eat tomorrow. You're unwilling to make a phone call because you find payroll services pretty boring. But nonetheless it is entirely possible you've found the thing the whole industry is missing.
I just would not bet that way.
+ n.b. I get phone calls from people whose budget is $9 a month (me: "Oh cripes, not again.") and people whose budget is $200 a month (me: "Now here is a call which I'd gladly take.") and people whose budget requires an NDA to hear ("Schedule a call for 3 AM in the morning? It can be arranged, sir!")
P.S. There exist interesting hybrid models where you have the self-service option and published pricing and then there exists the Call Me plan, explicitly or by implication. Find someone in one of those businesses, get them drunk, and then ask whether the published plans or Call Me makes more money.