Steve, I am yet to see one successful web hosting Instagram account that is not only engaging, but shows that it can convert. Here is the thing with Instagram in general - it might be the "king of social engagement", but from personal experience of watching friends manage their businesses (sending their products to large bloggers, using product placement), it doesn't convert.
Instagram does not comprise of a tech-nerdy audience who like to talk about servers. Instagram was originally designed as a platform for bloggers and photographers. Today it remains to be the most active demographic. However, people have a very hard time following company accounts, because they know they are willingly signing up to clutter their personal feed with ads, because that's what businesses do on Instagram.