It only gets revoked if they yell "Pick Color" when you walk through the door and you go with a pastel pink.
My top items (in order) are:
1) Good, sturdy boots
2) Good, high quality merino wool socks
3) Duct tape
4) Moleskin (when the above three fail).
I have a pair of Kenetrek Hardscrabbles that have given me issues for the past three years on the back heel of both feet. Did you know that they can "punch out" the heel some and get rid of the rubbing? I didn't know that till the ISE this year, and since my boots were due for a resoling anyway, I'm going to have them punch out the heel too. I can't wait to get them back and try it out!
I've found that the most important step 1 in prevent blistering, losing toenails, and beating up your feet is to go to a shop (like REI) get your feet fitted to a proper boot, and have the sales person examine the fit. I did this before going on a 35 mile 3 day hike on the John Muir trail in Sequioa National Park. I went with three other guys, all of whom are avid hikers and all three had wrong fitting footwear for the hike. I was the only one who didn't lose toe nails and get blisters. I also use baby powder for my feet and preventing jock itch along with super glue for any bad cuts or severe blistering (I'll generally let the blister dry out, wash it, neosporene, dry, then super glue with some sort of bandaid over it). Second biggest step for me is spending the extra money on high quality merino wool socks or performance blended socks (depends on the hiking, distance, weather, etc). I usually hike around southern CA on the temp changes are the biggest factor when hiking out here, especially if long distance backpacking. Best bet is to bring a variety because excessive sweating in your boots will lead to blistering (unless you're stopping frequently, which will ruin the pace of your trip). Lastly, duct tape, hands down. I've used medical tape, hockey tape, electrical tape, etc while hiking/climbing/backpacking and duct tape is by far the strongest. If you need to use tape then bring along the kind that is multifunctional, it could save your life.