The problem is the issuer can revoke or cancel your identity/invitation up to a certain point. Someone else on here can probably explain it better, but I think if that happens you would lose the coins that you had locked after validation.
Yes but ... total reward from single invitation is your invitee become verified, during last epoch was 33 + 98 + 198 = 329 iDNA - if you terminate the node you invited that how much coin you are resigning off.
New coin during 3 epochs will mine 388 coin and will get around 100 coins for validation = 488 coins. And he will loss 80% of that = 390 coins
My loss is quite the same as person i've terminated. So it's more like a extreme case scenario when someone terminates a node that he invited. It's not something that is commonly used for fun.
And it is