I don't think no marketing has been done. But their DAA platform doesn't support "regular" users yet, so they probably don't see the point of marketing just the BLX index, which even isn't managed by Iconomi team anymore.

I'm sure they are doing marketing that attracts institutional investors to become DAA managers. They managed to get 12 DAA managers, some of them are big investment companies. You don't attract these kind of investors by usual marketing technicques, you have to approach them and negotiate with them individually. You can't expect they'll become DAA managers becuase they saw some google add or read some PR article. And attracting reknowned investors is a kind of marketing itself, because if they trust Iconomi and the word spreads many serious investors will also feel comfortable investing in Iconomi.

30,000 users really is huge number but from my experience - I meet many people that would like to invest in crypto because of high profits they've heard of, but their knowledge of using computers is very limited. And ask me how do I do it. I explain possibilities of buying on exchanges themselves or investing with Iconomi. And everybody likes the Iconomi idea more. So there's not hard to see how they got that many users. Now one of the drawback is they still have to buy some bitcoin somewhere to invest on the platform, but once fiat gateway starts operating (start of 2018 I believe) and once they start marketing targeted to "regular" users I'm sure the amount of users will skyrocket.