JRob,
Why would hair last longer on a mono base than a lace base? Human hair oxidizes over time from exposure to the sun, washing, etc. So whatever material the hair is attached to should have no affect on the longevity of the hair itself. I used to see a lot of fine mono bases from former Richard Farrell customers and it's true the the fine mono base (although it's yesterday's technology) lasts a long time due to it's bulk. But a fine mono or a lace base with proper treatment will outlast the hair.
Regards,
John