Linotype vs FontShop

Hey i’m a new one here.

I wanted to know why buying Fonts at Linotype is sooooo much more expensive than the FontShop?

Especially for the ITC Officina Font. At Linotype it costs over 500€ and at the FontShop 35€ for one type of the Font. So if i buy 10 types i’m at 350€ which is way more cheaper…

What are the differences between both (other) shops. Are both trusted trader with certified Fonts?

Sorry for my bad english, greetings from Germany!

The ITC Officina Complete Family Pack (as sold by Linotype) contains 20 fonts, not 10.