What a load of rubbish ! Who is the name of the person who told you this ? 100 discs? LOL - I doubt that any epson tech would talk badly about their printers.
I personally use an EPSON R200 and know quite a few colleagues who do and have printed thousands of discs. I personally do some work for some companies and print 200-500 A MONTH and printer is working fine. If you handle your printer well no problem. Also I have installed a waste ink container and applied a mod to my printer so it sends ink out to a bottle rather than the pads in the printer.
The common problem is the CD/DVD tray is often mishandled and people push it too far in the printer or do not handle it properly and that thin plastic at the edge gets bent and this is when problems start.
As to the topic of this thread, indeed this is a symptom of a thermal printable dvd.
One thing I'd like to add - no matter if you use actual inkjet printable, the ink will always smudge if you touch it with wet hands - The EPSON R320 uses dye based inks and are NOT water proof, no matter if you let the disc dry 24 hours or not. If you are looking for long term storage you would need pigment based inks (and the printer to go with it)