It's a great sale. The thing is people who understand the benefits of 1300 numbers understand the benefits of quality domain names so you're always likely to get a higher amount for a sale like this compared to the sale of another generic domain in another industry with similar 'metrics'
Kind of like domainname.com selling for $1,000,000. Not sure it really deserved to fetch such a high price based on the industry, market search volumes etc. Not compared to some other industries anyway.
Regarding domainnames.com I think that is true, if it was a domain with similar metrics about say womens shoes it probably would have sold for no where near that level. The sale surprised me, but you've got a group of guys interested who are obsessed with domains potentially competing to buy it, plus they probably know how to get the most out of it and if there is one industry where participants might overvalue a domain relating to their industry it is the domain industry itself.