Businesses aren't worth what the owner asks for them, they are worth what the buyer is willing to pay for them. If those are the same amount, you have a deal, otherwise, make an offer.
I have a related post on my blog at blog.timberry.com from January of this year and there is a related post on Anita Campbell's Small Business Trends blog from yesterday. You can also search the web for "business valuation."
Brad Sugars is the founder and chairman of ActionCOACH. As an entrepreneur, author and business coach, he has owned and operated more than two dozen companies including his main company, ActionCOACH, which has more than 1,000 offices in 34 countries.