Well I will say one thing.. I don't mind paying for ground if we're actually doing ground... But one thing I will never do and I don't think that instructors should do in general is charge a guy for walking out to the plane... That would be like a mechanic charging you for walking out to your car in the parking lot... I've had more than one guy try to charge me an extra .2 for walking out to the airplane.. I find it ridiculous.