San Diego wouldn't crack my Top 10 but I hear you. Beautiful. Good tacos. But, not a great sports town, far from Florida, lower ratings for your Pacific time games, fewer endorsement opportunities, high income taxes.
And they won 14 fewer games than the Phillies last year.
I definitely think "valuation" also includes Harper's likely higher impact on ticket sales and NBCSN Philly ratings and ad rates. Winning goes produce that too, but not up front.
Neither of the off-season moves really make sense in the contest of the FA chase. Segura affected Manny (even if it is ultimately smarter to play him at 3B) and McCutchen affected Harper.
Talking about valuation isn't very good spin, nobody wants to hear that. But what are they going to say, they weren't interested and prefer Harper? No leverage there.