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I recently bought a few blue inks called "Game color" made by company Vallejo but one really disturbing thing that I noticed from the back was that the ink is water based. This has me concerned over the water resistance of said ink. I notice after the inks dried, just rubbing my hand on the painted part causes some of the pigments to come off which has never been an issue for me with GW paints. I won't exactly be rubbing a marine's pauldron nonstop in an actual game but with long term handling, I fear that the pigments can come off and create bald spots everywhere. Worse, if they get on other parts and smudge the colors.

Have anyone had any good/bad experiences with water based paints/inks?

Water based inks and paints are what is known as an 'acrylic' paint. It is what 95% of people here use. All GW paints are acrylics. Once dried they are not water soluble, so don't worry about that. Vallejo is considered one of the top acrylic paint brands. If you wash your brush off in water when you are done using it you are using a water based paint. The other types require nasty chemicals to clean your brushes.

Non acrylic paints require special thinners to use. The other 3 main types are enamel (need paint thinner), laquer (need laquer thinner), and oil (need paint thinner). Non-acrylic paints are fairly toxic, many require the use of painting masks to protect your lungs.

Acrylics are a bit fragile compared to the other types of paints, which is why you always seal with a laquer finish, like GW's purity seal.

While I'm a big supporter of the other types of paints (they tend to have great depth of color, a slow drying time that allows for blending, and a tough finish) 95% of models you see, even at the golden demon awards, use acrylics.

Especially good modelers will use oil or enamel paint for weathering, but most of the coat is acrylic.

I'm confused by your post. Can you describe better what exactly your doing with the inks as far as application? Are you applying it over a paint or onto bare plastic or a primer coat? And are you comparing an ink to a paint because they behave very differently. I can see if your applying ink to a bare unprimed mini it would rub off or if your mini was already sealed it wouldn't bond but that really has nothing to do with the water aspect of "water based acrylic paints" which as previously mentioned is the standard medium for model building. Now Vallejo game colors are some of the best paints out there and even have a little extra in them to make them more durable once dry (vinyl).

Now the only paint I've had the problem with rubbing off is the silver and gold from the model air line. For some reason they just don't stick but then again those are airbrush paints so it may be the thinned out factor.

Maybe some pics of your tests with the inks would help....