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or two domains point to the same site, and have a $20 in the logo slashed out, replaced with $15.You're the creative one - make it work :)

This would make for a fun A/B test: "$15 + $5 extra" vs. "$20 - $5 discount".

You might collect some evidence that people like getting a deal more than getting hit with an extra cost.

to get a design for <$30, your not going to notice a huge difference in acquisition for the $5

Probably, yes, but hard results from testing FTW.