Clearly the Browns were on the phone with the Niners, and set the price.
This means that we really liked Trubisky, and the scarcity in the market of top quality QBs, or even people that have a CHANCE of being one drives the price here.
Remember we bid for Mariotta and Goff too, and failed, so this was Pace's shot I think.
We can debate the cost, but with Glennon and Trubisky, we are going to have a QB pretty soon one way or another. And that has a lot of value too.
Also, Glennon was courted by multiple teams at a pretty good price. If Trubisky plays well, We have Glennon's contract for 2 years to sell to a team who wouldnt owe him much at ALL, so all that value would be in draft picks to us, and any team, especially one in cap hell could bid. This could be very shrewd indeed.