My knowledge of NFL isn't amazing - so how would the Jaguars compare in a global fanbase and general coverage it would give a sponsored stadium as we would?
In comparison, they would generally be a 10th-15th place finisher in the Premier League. Mediocre. Not a good comp for Liverpool.
Here's a good table of many North American naming rights contracts, though it is old (2007?):
http://espn.go.com/sportsbusiness/s/stadiumnames.htmlIn viewing it, good Liverpool comps would be (with yearly cost):
FedEx Field Federal Express Washington Redskins $7.6 million 2025
Fleetcenter Fleet Bank Boston Celtics, Bruins $2 million 2010 (this is now TD Garden - don't know the deal)
Lincoln Financial Field Lincoln Financial Group Philadelphia Eagles $6.7 million 2022
Staples Center Staples Los Angeles Lakers, Kings, Clippers, Sparks $5.8 million 2019
As you can see from the big list, the numbers vary wildly. I suspect it depends upon the team's popularity and also on what signage, etc. is part of the contract.