I follow this manually. Buy 100$ worth top 30 crypto every week on bittrex.
I like this idea, but only if it's scripted and for more than $100 per run.
My point about doing 30 trades every week manually is a lot still stands though. Maybe I'll try scripting this with Bittrex's API. It would be cool to have an option to scale each trade size by the current relative market cap, so you can have your own crypto index fund.