If you earn more than $188.89 (not including checklist bonus) in a year, then you can profit by being a premium member just from the increased checklist bonus alone without referrals.
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188.89 x 0.09 ≈ 17
where 0.09 or 9% is the increase in checklist bonus and $17 is the cost of one-year premium membership.
Of course, you have to be able to consistently complete the daily checklist for this to work.
Regarding ads, I think I get at least 4 extra standard ads every day but it doesn't add up to that much in terms of earnings.
As for Clixgrid, well, 2x of a small amount is still a small amount.
Edit: As others have pointed out, if you click the 4 extra standard ads every day, you can already recoup $14.60 out of the $17 paid for the premium membership.