Deciding Whether to Continue a Losing Campaign (with examples)

I'm a complete newbie testing offers from Aff. Network (I have experience working in house)

I want to share three offers that I ran in the last few months, all of which I paused. In all three cases, the AM told me that the average conversion rate of the offers was above 5%:

Offer1

• CPA Goal: €44
• Payout: €55
• Spent: €168.36 (3 times the payout)
• CTR: 0.08%
• Clicks: 930
• Conversions: 0
• Running for 4 days

Offer2

• CPA Goal: €10.5
• Payout: €13
• Spent: €144 (11 times the payout)
• CTR: 0.2%
• Clicks: 3270
• Conversions: 0
• Running for 4 days

Offer 3

• CPA Goal: €8
• Payout: €10
• Spent: €168.41 (16 times the payout)
• CTR: 0.1%
• Clicks: 1272
• Conversions: 2
• CPL: €84 (8.5 times the payout)
• Running for 4 days

The main point that I want to discuss is the following:

If you spend X times the payout without a conversion, or your CPL is X times the payout and having another conversion doesn't change the fact that you are still far from your goal, does it make sense to keep running the campaigns just because they have been active for less