I have 33,000 km on my 2007 GSX-R600. Lately the chain has been hanging quite low- I left it like that for about 2 weeks while waiting to get to the bike shop.
At the shop I was told I should get the chain and sprockets changed out. This is after I had already dropped $250 on some other work and they would have to order the gear in anyway.
I don't mind puttering along for a while making do with what I have now for another 5000 km until the next service. How big is the risk of the chain breaking on me and screwing up my tranny or other expensive parts?