While I'm not the most advanced drifter, I just started trying drifts out of 180 endos to add some speed and craziness to my practice. At first I had problems breaking the rear tire loose and instead I would just do a wheelie.
After a few failures, Anthony mentioned I should try leaning forward and letting the bike roll back a few inches. After that, they came easy.
Drifting out of 180 endo's is a really fun trick and it makes your riding look 100% more exciting. Have fun trying it!