I just went through this mate well similar
a buyer got code from me, then did a CC chargeback on me, even though he had the code up and running, paypal wouldnt side with me,
after 3 months of pounding at paypal and the customer i got this
Dear XXXXXXXX, We are pleased to inform you that we have successfully disputed chargebackcase #PP-409-296-263. The buyer's card issuer has decided in your favor and within seven days you will receive reimbursement for $150,00 USD. It is PayPal's standard practice to dispute wrongful chargebacks. One of the benefits of using PayPal is that our team of chargeback specialists will gather the necessary information from you and work with the creditcard company until the chargeback is resolved. We appreciate your prompt response to our request for information aboutthis transaction. -----------------------------------Transaction Details----------------------------------- Buyer's Name:XXXXXXXXXX
Buyer's Email:XXXXXXXXXXXXXXXX
Buyer's Transaction ID: 5BK153797R230710T Transaction Date:19. Dec 2007Transaction Amount

150,00 USDCase #:PP-409-296-263 Your Transaction ID: 5BK153797R230710T
now paypal did nothing, they told me to go whistle, i personally tracked this guy down, called his local police station and filled a complaint, then i contacted his CC company with every bit of documention i could, i called his CC company and they were brilliant, took all my email and msn convo's and listened to me,
they then contacted paypal and issued the refund, paypal said it was all them, bollox it was all me, so bottom line, how much do you think the host is preperd to go?
if you've been done wrong use your protection rights, thats why there in place, just like me you should persue this until you get what believe is right and fair.
Question: Will a CC charge back after losing a claim put the Buyer's Paypal account in jeopardy?
yes and no, paypal will take the funds out of his account, that could put him in a minus figure if so, unless he pays it paypal will send the collectors after him, if it doesnt put him in a minus, then no it wont hurt him.