some questions regarding cpa

Hi.i have some questions about cpa:
1.it is dangerous to have a high epc?lets say i have 5 cliks and 4 actions.
2.are sites like neobux accepted by the networks to drive traffic?can i use the direct referal link with them?

thank you

i can tell about your first question. Hi EPC is not a problem if you dont give them fake conversion. if you do so you will be banded.