S'mon said:
1sp/day is 3gp/month or 36 gp/year, so a slave labourer would cost 18gp, which is about what they cost in my game. More if trained or educated, less for elderly, women, children etc.
Yeah, I did the math wrong. I figured 1gp per day, not 1sp per day. I also only figure on a 6 day work week - I may be a slave owner but I'm not a ruthless SOB!!

The confusion stems from the fact that in my world 1gp a day is the base salary. It fits more in line with the world I envision. People own their own houses (three years worth of salary) their own horse, etc. A common laborer would have to save up for 2 years and not spend anything just for a horse at 1sp a day!! A backpack is 20 days labor!! Sorry, but 1gp a day is more inline with prices.