unethical to search for higher BA fees? (REALTOR)

[Devin Mann]

as a buyers agent someone wants me to find them some properties.  As far as the buyer agency fee goes, standard seems to be 2%.  i find some at 2.5% and 3%.  

is it okay if i trim my search down to the 2.5-3% homes only? when there is a higher BA fee, does that mean the seller is more motivated?