Seeing the ground is reason i think many get "bang". My wife is not keen on ML's but flew happily in FaST and let all the kids go in it & KWK (They are little). When I asked why she said these are "real aeroplanes" and not "garden chairs". Perceptions are a huge factor and I think that is the perception out there. Similar to a "bare bike". Some love it, but they are in the majority and in the Evil Knievel category as far as Joe Public goes...
Not everyone can afford a GT450, but pimp a windlass and I am sure perceptions will change. I am not talking about the wind in your hair, bugs bounding off your teeth die hard trikers (of which I am sure the majority of the forum are), but those folks who are keen to fly but are hesitant more due to a lack on uderstanding and are swayed by perceptions. (You all know the reaction you get from the uniformed when you mention you fly a trike).
Many can not afford 3 axis, but the idea of strapping yourself to a couple tubes of ali seems to scare most. (What is after all the difference in construction materials between a trike and a Cheetah?) Perception however is that a Cheetah (only used as eg...) is a REAL aeroplane and a trike is not. Why? Because it has no cockpit.
By way of example compare the following...

When asked i i could fly them my wife said I could fly the one on the right, but under no circumstances the one on the left....

Same trike?