Many programs are not worth your time and money, but some will flat out take your money and run! Here's a list of websites who are currently or who have in the recent past Scammed/stolen from their members and advertisers. I leave images for those still in operation.

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GlobalPrimeEquitys Payments all show as pending, never paid

Titan Network sites are not paying
ubuxbizAnother "former" Titan site. Gone
TitanPrize.com

Another Titan site

Began as Titan Network and then "sold" problems since, limited site availability, new owners or just a failed PTC?

Selective payments, admin associated with previous scam sites


Poor communication from admin, money refunded
problems from the start
10buxnetGone along with sister site pclicks
pclicks Gone with 10buxk
Bux3com Script problems, reports of non-payment along with sister-site Worldbux
WorldbuxFrom Bux 3.

Poor system, access problems, poor communication from admin.
BuxainSelective payments,Disappeared now 404.

Selective payments, spam from admin.
ClixearnNot Paying
Incomebux404
12Surfinstant Changed payment terms, disappeared.

Messages from admin that payments won't be made, asking to join his new program

Same admins as Xclix

12x12flashpy
Unreachable several days, some payment issues.

On-again off-again, mostly off

4buxinfo Out Of Business: 1 June 2008
PTCashbiz
Unsustainable, poor communication and management. Scam.
Tikicash Paid to offers, slow to confirm, unable to opt-out of offers (all say pending, once mail is read!). Very confusing.
TakeTheInternetBack Payment Requested 3 April 2008:Terms changed 1 May 2008. No Payment received. Site is still taking advertisers and members' money.

NightBux=SCAMSet payout too low, per click too high, paid for too many of own ads. Split when it was time to pay everyone
Paidvg=SCAMStarted as a well-paying program, ran out of steam and began taking members' money before disappearing entirely.