It is affordable for the workmanship and materials used. All stainless steel and aluminium.
As bambax said - that's not what affordable means. Affordable is all about whether the target market can afford it, not whether it's good value for the materials and work put in.
Two of the most important advantages of a folding bike, namely the weight and the folding volume, are also the largest cost factors in the product price.
The price is a matter of quality of material and manufacturing and number of parts. The lower the weight, the higher have to be the quality, the more compact, the more high-tech parts are required. the more expensive will be the bike.
You can't produce a folding bike with only 10 kg and only 55 l of folded volume that can easily be ridden up to 25 km/h and is stable for people from 1,30 m to 1,95 m and up to 100 kg for prices below 2,000 euro, unless you produce 100,000 or more in a year or you sell directly to the customers.