The harsh truth of the matter is if you aren't earning enough for a payout each month with a particular site it is because your portfolio isn't strong or large enough.

Wow, this is a WAY oversimplification.  It might be true of the top 6 or 8 sites, but there are small sites like GL, Stockfresh, etc. where there just is not the customer base to produce a payout each month for most contributors.  I get a payout about every other month from the small outliers that I contribute to.  And they have the same 7k of my images that the major sites have.