Why are there no turkey eggs in the shops?

According to the site: http://www.britishturkey.co.uk/cooking/faq.shtml - 
'Turkey eggs are not available on a commercial scale simply because there is very little demand. They are also expensive to mass-produce. Turkey hens lay an average of 4.5 eggs per week over 24 weeks. Although the runny yolk is not ideal for frying, turkey eggs are delicious scrambled and particularly lend themselves to baking for an extra fluffy texture! Many farms sell eggs at the farm gate to local shoppers.'

(from: http://harvestmarket.wordpress.com/2011/10/28/turkey-time-again/)

However, in this site: http://www.guardian.co.uk/lifeandstyle/2011/apr/10/turkey-eggs-uk-supermarket-debut 'Waitrose responds to demand from consumers keen to cook with growing range of speciality eggs'. 


So perhaps next year I'll try some and see what they're like!  Has anyone eaten one before?