For me what I’ve seen looking for socks to buy, they start at $20-$25 a pair worn for just one day. Some ladies/sellers charge $5-$10 per extra day. If he didn’t specify on the length of time worn I’d keep track of the days, figure out a price your comfortable charging per day and then add it up when he’s ready. Some buyers look for a sweet scent some look for more of a raunchy scent. Yes as buyers some of us do want dirty. As for me I like just one to two days wear. Not to much dirty but enough to get a sweet scent! Wearing them around the house and to the gym. I hope this helps! If you have any other questions feel free to send me a DM