Subsequent (junior) Tax Liens

[Thomas Blees]

Hi,
I am new to Tax Lien (TL) Investing and have a question:
What exactly is my risk when buying a "subsequent/junior" TL (e.g. a TL from 2014, when there are still TLs from 2012, 2013 which haven't been redeemed yet)?
As far as I understand, in this case I (very probably) after the redemption period wouldn't be awarded with the property. But the person who is in possession of the very first TL (lets say, from 2012) had to pay me for my TL (from 2014, in this case), including interest - correct?

So, if I wouldn't be interested in the property in first place - and just looking for the interest paid - what would be my risk??

Thank you very much!
Best regards,

Thomas