LG,

It can be done with a small loss at level stakes and a high strike rate. You wouldn't want to be losing more than 5% though or it will hurt you and you need a very high strike rate to make it work (85%+).

These 2 things mean the inevtiable losing run is usually going to be few and far between and you can take advantage of the winning runs in between.

A losing run will come that knocks out your bank. It just depends on how many times you can double your bank before the losing run strikes.