I hate one word answers since it's not always easy to tell what you're saying no to...that said, I still say yes, but it's based on the idea that I actually know how Free Agency etc. works in baseball now. I may have it wrong, so feel free to correct me if that's so, and perhaps I'll change my mind then.
My understanding is once you're a FA, the player/agent is looking for the highest(or best terms) bidder via being given offers and accepting/rejecting those offers. Boston wants Bay, they offer him a price, he says "I want more" and eventually others can bid, right? So then Yankees offer more, and if Boston can top it, Bay gets to pick which one?
Salaries at that point are determined by what teams will pay. Any time you have such an arrangement, player greed plays a major role in rising salaries, as well as, obviously, the team/cooperate ability to afford the greed. When the economy is decent, they rise and rise as (at least some) teams can afford to bid high to snag who they want.
If that's the case, then if a bid Bay accepts/courts is a new high price, it increases the average player salary of his caliber and thus the next player desires bids closer to "what Bay got" and so on. By Bay deciding that, say, 80 million sounds better than 60 million, he starts or continues the chain reaction, which doesn't cease unless the economy goes in the shitter for a long period of time. Thus, it is/can be one or several players each year that get higher offers that lead to even higher average salaries the next year.
Since Free Agency/arbitration 30-40 years ago(?), average salaries have skyrocketed by what...5 or 6 thousand percent?...it's not entirely because of the player stuff, of course...but it is a large part.
True, but the fact remains that once a standard for an "A" caliber actor is set/rises, it tends to remain high...so whoever is the 'next big thing' gets the huge/ever rising salary while the no-longer A-list salaries drop. It doesn't matter who the actor is...the ones the studios want will command the high price tag, the price for A-list actors never really decreases. I'm not, btw, saying the system has to change, since I'm not sure there's any better way. But it is...stupid. imo.