pricing - Client buys logo but wants to buy other concepts too

I have a client that hired me to design a logo for them. By our contract I supplied them 3 concepts from which they chose one.

After all was said and done the client asked to buy the other 2 concepts as well. For example they want to use one of them as an artwork for a T-shirt design.

I'm having trouble quoting those 2 other concepts. They came into existence during the work I did for the first logo... so technically I wouldn't need to put extra hours into them.

On the other hand I don't want them to go of cheap because then they get 3 designs for the price of 1.

Does anybody have experience with this?

Also they told me they wanted to use one as a t-shirt design. Is it common to ask a flat fee or are royalties a better approach in this case?

Answer

Unpopular personal opinion :))

With that being said ( :)) ), let's put things into perspective, ok? You have a contract, in that contract you agreed to supply 3 concept designs out of which they chose only one! That's it!

In any such contract, you should also add that if the client should want 2 or all 3 concepts developed and delivered, they agree to pay 30% (or whatever you feel like releasing your designs for client use is worth) of the contract's total for each other design.

Basically, they pay x for the main design and an extra 30% of x for each other design. That way, they get a fair price of x + (60% of x) for all 3 designs.

3 at the price of one and a little over half. THAT is your fee for releasing the designs (allowing them to use it) to your client, not for creating them. There's a difference. :)

PS: In some cases you may also want to consider what @Digital Lightcraft said at point 1:

• Do they stand to profit from the t-shirts?

This usually adds more value to your design but not all designers take the use purpose of the design into consideration when price tagging/releasing work.