You forget one thing:
Victron has official reseller and certified installer (I am both in Estonia) and we went trough a huge set of training to get there.
We, as reseller and installer are responsable to the customers.
People want to buy always a cheap as possible and buy stuff wherever they can get it cheap and then complain, that they do not get any adequate support.
95% of the online shops including Amazon are not qualified to support their customers at all.
Oh, Victron is an official vendor on Amazon and this is the only exception, that you can get direct support from them.