I agree,....25 BDF is a good deal...my brother and I typically charge .35bdf [hardwood].
On the other hand...
Most portable mill operators charge a setup fee for going out to your place. Typically $50, depending on distance.
If a blade breaks, you'll get charged for it, which could run you $30.
And if there's metal in the logs...
Then, if the operator has to use a skid steer to gather up the logs ( that's another added fee).
...issues not encountered if you can haul to a mill.
And having a portable coming to you, means keeping all the laps and scraps...for you to dispose of.