Alphawolf - Bill just said it the best. Every month is going to have ups and downs. I've had months where I've made seriously nice money and other months I've sucked ass but still kept the same sponsors.
My rule of thumb is let a sponsor ratio go to 0:1000 or 1:2000 before you chuck them. And just because you're having a crappy month with that sponsor, doesn't mean next month they won't convert at 1:100. There really is no science to it, if there was, we'd all be rich. It's a lot of trial and error.
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