Can you use kilz on canvas in place of gesso?

So far, so good! I have used Kilz (Original) as a primer for oil on canvas painting since the mid 90's. Given the high cost of gesso, I turned to it as an alternative. No sign of color fade, paint flaking, etc... But I still wonder about it's tack and cohesion, over more time. I am a believer of it as a poor man's gesso. Furthermore, I would not be surprised if it held up longer.