Let's use the actual, concrete numbers.
To save people the effort of looking up his contract terms, here's what Gallagher is owed on the last five years of his deal:
2022-2023: $6.5 million
2023-2024: $8 million (!)
2024-2025: $9 million (!!), at the end of which he turns 33
2025-2026: $6.5 million, for a 34-year-old winger who already has injury concerns
2026-2027: $4 million
Los Angeles isn't so awash in cash that these figures are acceptable in the least, as
@F50marco has intimated above. (In contrast, we're paying Anze Kopitar $7 million for each of the last two years on his contract.) A cost-conscious team like Los Angeles isn't going to take Gallagher on unless it's with at least 40% retention, or Drew Doughty somehow gets an uncontrollable urge to play for the Canadiens.
My friend
@PuckLuck_77 has his trade value right.