When an II member gets an exchange into any resort, they are charged an exchange fee which they would pay for any exchange. The amount varies whether it's domestic or international and the fees are going up to $121 and $149 with a $39 guest certificate fees for someone else to use the week. In addition to that if they get an exchange into a WDW DVC resort, there is an additional $95 that DVC labels a "resort services fee". It's not just for transporation. The truth is that we've all paid for those services provided so I suspect that money goes to paying the admin cost of the exchange service.
It is a sore subject on TUG as most feel that an exchange is an exchange. In a way I agree that it's a petty fee. However, there are many other resorts that charge extra for things like AC and in some cases charge exchangers and not owners.
I do not believe the fee is charged for HH or VB. Also of note is that in the current II book, WLV is not listed with the "resort services fee" though I suspect it still applies.