I’ll make this one muy briefo.
You can see, touch, and smell products before you buy them. So it’s relatively easy to know what you’re getting before taking out your wallet.
But you can’t experience a service until after it’s been delivered (which also usually means after you’ve already paid for it).
Consequently, there is a greater burden on the seller of services to engender trust with prospects in order to close the sale.
“Why You Usually See Three-Tiered Service Pricing”