You receive actnearn tokens against your delegation to us. for 25K steem power you will receive 250k actnearn tokens monthly. With current price of actnearn token as 0.002 steem - you are expected to have 500 steem.

If u do curation on your own then you are expected to make 250 steem.

So effectively you can potentially have 100% more steem rewards per month

Hope it makes it clear to you