I agree for a couple of reasons. The tank isn't new and you don't really know what kind of condition all of it is in. What if the filter or heater goes out on you after you bring it all home and set it up?
When you buy new you can bring defective stuff back to the store for exchange or refund but used.... buyer beware.
That is why I think the price is high. It has to be worth the gamble. If you think it's worth it go for it but I'm not feelin' it.