I wonder what the postal charges are like?
For that price it is probably bingo card dabbers ink.
What can go wrong?
Could be the wrong colors, or wrong density, making your driver no
longer produce images the correct colors.
Could dry too quickly, slowly, causing smearing or other problems,
including head clogs.
Could have contaminants in it, causing head clogs or filter clogs.
Could have incorrect formulation that might bleed, or band on papers you
usually use.
Could use colorants that were not stable, causing rapid fading or color
change on display.
Could have no chips on the cartridges, or the wrong chips, causing them
not to be recognized by the printer
Could have bad seals around the ink outlet, causing the ink to leak out
or for air to end up in the cartridge
For those prices, could be empty old cartridges ;-)
Who knows, maybe they are being sold below cost to get you introduced to
them, and they are just fine... try to get a written warranty from the
company such that if the ink damages your printer, they will cover repair.
Art