I have read through some previous discussions about custom fonts and quotes (all quite helpful), but I don't recall a specific mention of pricing a "modified" font for clients (as opposed to a start-from-scratch "custom" font).
Modified, in this case, means altering just a few glyphs to an existing, published font to fill a specific branding need.
Aside from amount of weights, glyph count, features, etc... I'm wondering more specifically about the rights assigned and cost differentiation. So these scenarios below would be costs for the design work plus the license type.
Scenario 1: Modified font is priced based on the glyph design alterations, and the license is non-exclusive (essentially matches the cost of licensing the existing font).
Scenario 2: Modified font is priced based on the glyph design alterations, and the license is exclusive for this modified version (other, non-exact, modified versions can still be created for different clients in future).
I figure a pretty big price difference between Scenario 1 and 2 due to exclusivity, so my question is: how much of a difference? I think I'm defaulting to comparing this to a fully custom, start-from-scratch font where an exclusive license might double the cost.
In most cases, if a client is requesting a modified version, I would think an exclusive license would be desired to protect it.