Person or people not willing to negotiate on their service or product fees even if they know that the fee is unfair but the person paying can not find an alternative product or service elsewhere.
To take advantage of someones finance then they are most vulnerable.
Derivative of the words 'tight' (tight ass) and 'takers' and slang word 'Piker(s)'
"can you believe those dam tikers! they still charged my credit card even though I canceled my subscription 2 months ago!"