It's the same with any amount of money in my opinion, if i give someone the tip, and they put it on and it runs 2nd or wherever, then i feel guilty for not giving them a winner, although it's up to them whether or not to follow me and put it on, you still can't help but feel responsible.. for example
I was at either eagle farm or doomben one day, and i was coming back from just having collected some winnings, and sat down with my mate and his sister and her boyfriend and his sister was telling this guy that i had been winning all day and that i would give him tips, i found out he was the father of a guy off totally wild, and he had plenty of money, while i only put 5 each way on it, he would've put at least $20... it ran 4th.. :| so since then i've been pretty quiet and if i do give out a tip i say for the place or back it with a favourite for the quinella.. i don't really know anyone 'in the know' when it comes to tips, it's really just my gut feelings and my selections.. i don't know how to get to know these people.. ehhe