Description Box
It would be reasonable to put things in the Description Box that have the best possibility of encouraging more bids. If a domain earns $1,000 per month then listing this in the description box would certainly encourage more bids. If a domain earns $0.10 then a listing would not help the encouragement of more bids. Judge in relation to the current bid. Listing a revenue of $5 per month when the domain has an offer of $5,000 would not help too much, but this revenue would certainly be encouraging to potential bidders if the domain has a current bid of $200.