Thanks for sharing that,an interesting article.For me,best reason is nr 1:

Agate Blockchain: with its high speed and very low transaction fees, the Agate blockchain is way different from the rest. Completely decentralised and highly scalable, the blockchain has Smart Contracts for daily transactions with total reliability and security. A token generator engine and a block explorer to duly record every transaction with transparency are other added highlights.

I think its incredibly important to have your own blockchain when you are dealing with something like ecommerce,so you are not dependant on 3rd party blockchains.