You didn't get the irony... oh dear.
You're offering to pay for designs used, meaning someone has to sit there and design them. And you then get to handpick which designs to use and you'll only pay for those?
Not a chance - that's not how it works! That's exactly like me saying "Send me all your t-shirts, I'll keep them all, but I'm only going to pay for the ones that I wear".
Or - "I will pay £50 per design"
This gives no valuation based on how long a person worked on a design - for example my base rate is £50 that's the fee before I even start (maybe a Students is half that? Who knows?) But I then take into account the time I spend designing the design - that could take 3 hours - resulting in £200 design - and you have the audacity to say that you will only pay £50 per design???
No way is that fair in the real world!
You cannot dictate the value of the design - only the designer does that.
Designers - submit your quote based on your hourly rate and how much time you think is enough to spend on a project, add 150% and send to the OP.
The above statement by you "I will pay £50 per design" is equivalent to me saying "I will pay £1 per t-shirt design, regardless of how much of your time you put into it!"
Your disregard for our industry is insulting. But seen as this is paying job of a measly amount and some students may be interested in it - that is the only reason the thread is still active.
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