On the other hand they bring in the crowds and cash to put towards other project such as conservation, they also have some educational value, genetics etc.
I have to say I dont agree with hybrids particularly not when it comes to interbreeding subspecies such as tigers, as these hybrids are almost impossible to keep track of. I am however glad there are still a few ligers around as they are one of the most magnificant animals I have ever seen and a picture simply does not do their enormity justice!
What zoos in the UK still display hybrids? I know Heythrop have a Liger, Colchester have some zebra x horse hybrids an of course a lot of safari parks have hybrid baboons etc.