Getting contracts is slow.  You might designate 1TB of space for use, but only get a slow consumption of that space over time.  I have some drives that have 600GB actually being used, but that took several months.  The payouts are decreasing over time as well.  The average payout per GB is a tiny fraction of what it was several months ago.  You can easily double the size of storage being used and still get less of a payout from the previous month. 

Not sure of the future, but I split my drive space between Storj and Burst.  As Storj shards begin to fill, I expand their size from the Burst pool.