Whats normal Parking View to Click Ratio?

[linkfm]

I just wonder to know Whats normal Parking View to Click Ratio?
I have about 50 domains listed and they got parking views but haven't got a single click yet for about 3 months. I want list more domains but just wonder it'll work for me or I'll waste money to buy domains in future...

 

[Theo]

Depends on the domains and the keywords used.