Years ago, the largest mail order business in the world (Dell Computer) saw a substantial increase in business when they started offering "free shipping" (meaning shipping cost are included in the price - buyers are not stupid and realize that). Nothing "dishonest" about that.
My eBay sales were up 40% in the first six months of 2007 over 2006 when I started offering "free shipping" for combined purchases exceeding $25 to Canada/USA. Buyers like free or low shipping charge.
And yes, sellers offering lower shipping charges understand they are in fact paying eBay a bit more on FVF. So what? Look at the bigger picture.
If you give eBay an extra $0.20 in FVF in a transaction, but improve your DSRs to become eligible to the 15% FVF rebate, you end up way ahead financially and will show a better level of customer satisfaction, not to mention the possibility of increased sales and profit.
"dishonest"
???
I do not think so.
.