mark up on alcohol is bad, especially for hard liquor - but if someone brings it to you or pours it for you, you should tip for it my man lol..
mark up on food is worse IMO, I can go to my local store and get 4 pounds of cut chicken breast for around $9-10.00...I can make that into grilled chicken breasts/sandwiches the entire damn week, but go to BDubs or wherever and get a grilled chicken sandwich (and lucky if you get a piece that is 5oz or more) that will cost $10-12.00 alone...same with burgers, same with salads, the mark up on food is insane (obviously that is how they pay for staff/cooks/bills/etc)- so if you don't tip on alcohol because you think they jack up the prices, I think it is even worse for most of the food we get.