How Much Does A SLEEPING BAG LINER Really Help?

Do sleeping bag liners help? How much extra warmth do they actually provide? Do I need a zero degree bag, or can I just add a liner to my pack on those cold late season trips? I took the Sea to Summit Thermolite Reactor Extreme to Wyoming's Wind River Range and tested it for myself. This liner claims to give your bag a ridiculous 25 degree boost for just under $70. Is that really possible?

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From ZPacks:
Duplex Tent https://zpacks.com/products/duplex-tent
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Arc Air Backpack- 50L https://zpacks.com/products/arc-air-5...
Water bottle sleeve
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0:00 The Set Up
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