If you're interested in being here long-term, there are things that are worth the investment at every buyin level. (Though if you have more than $100k USD to put in you might end up in political wars.) @steembasicincome shares are a really nice value and you can buy them for as little as 1 STEEM.

The question is more how much investment, or how much return, do you need to justify spending your time here? Then you can figure out what you would need to put in to get it.