In these two simple examples not only a piece made with 3D Hubs is from 100% to over 400% more expensive than Weerg but in addition to this it offers much less guarantees: take a look at the tables.
3Dhubs now Hubs is a trading company and does not produce anything: they just earns a commission on the work of others. Weerg is a real factory located in Italy and ALL the parts we produce are made in-house. You can come to visit our production plant, see the machinery and your parts in production whenever you want. We have no secrets.
You want obviously precise, adequate and certain prices. You think that this helps you make proper decisions, and it is certainly not elegant to present a quote to the customer and then have to change it because your supplier has not found anyone desperate enough in the whole world willing to do your parts for that price. With Weerg the price of your pieces remains that of the online estimator, always. And if it changes it changes for less.
In order to obtain lower prices, 3D hubs sometimes have jobs carried out in countries where workers accept lower wages but this involves customs fees that are not always foreseeable when placing the order.