It looks pretty obvious to me that the seller did not want it back because they recognise they are incapable of meeting its needs. The sad side of the equation is that information on the keeping of lorikeets in general, and the Rainbow Lorikeet in particular, is readily available. Yes, it is more work than exclusive seed eaters but that is what you take on to be the proud owner of such beautiful and intelligent parrots. Their behaviour can be moulded accordingly, from fledglings to that which you wish to attain as adults. You simply have to be prepared to put in the required work. Evidently someone was not prepared to do so.
Blue
