i have the onatah PM... and i have to admit i don't carry it that much either. I've had it for about 3 wks and carried it about 3x. buy some suede protectant from apple guard. they have 20% off right now.
i say keep it! it's brown so you don't have to worry about staining the bag. just don't wear it while wearing light colored tops and you should be OK.