I like the way it looks, but it requires a minimum moisture content in the air, which I don't have out here in the desert, so I've never installed it.I can't think of any reason a buyer would object to it, other than the obvious one that they have their heart set on red cherry floors (which is a problem with any and every flooring you use)I don't think bambeoo is any cheaper than other wood flooring, so you chose it because you like the way it looks.

It resists moisture but when moisture gets in it's tougher to get out thus creating a better environment to breed mold. 

The reason for it was because the drain and the shower liner (that leads to the shower basin) were both bad and the new tile going over the old tile certainly didn't stop the moisture from getting through.  

I have just finished putting down 3 pallets of laminate in some of my rehabs, the most important things to look for are length of tongue (the short tongues have a tendancy to want to snap, plus they can move eisier), resistance to moisture, and of course looks.

He said that its more vulnerable to moisture and will buckle at the doorway.

I still don't think underlayment matters much except maybe over concrete because of moisture and I'll put tile over plywood all day long unless it feels bouncy then chances are it will crack without more plywood.My thought is it says I can put it over plywood on the bag of modified thinset so if the floor is solid then why spend the extra time and money on cement board if I'm using 0.49/sqft tile anyway and doing it myself

With a slab foundation is there a worry about moisture wicking up?

Those $20 pin-style moisture meters at the big box stores are darn handy. 

In an area of high moisture and humidity like that, the foam will hold the water.

First off, get a moisture meter and get a reading off your slabs.