Get an SLR and throw out your point and shoot?

Do you need an point and shoot camera if you have an SLR?

All cameras;
http://www.getprice.com.au/digital-ca...

My SLR:
http://www.getprice.com.au/Canon-EOS-...

My Point and Click (although I don't use i much anymore, in fact this is the new one. I paid $800 for mine)
http://www.getprice.com.au/Sony-DSCT7...

I guess it's good to have a small one you can take anywhere with you but I tend to just use my camera for snapping stuff that I don't care about