People can be weird. Two FP stories:
1. I had 3 FPs for TSMM at DHS on TSMM's
opening day in 2008. We had already ridden it 10 times on our trip and my kids just did not want to go again. The standby line was 80-100 minutes mid-day.
So while standing in front of TSMM a lady walks up with two children to get in the standby line and I offered her the FPs. She looked at me like I was trying to sell her some snake oil and got in the standby line. I then offered them to the next guy coming up and he took them and said "thanks"!
2. While standing in line at DLR I heard some people talking about their FPs and how they were past the window. I told them casually how DLR accepts FPs after the window. They looked at me uncomfortably and it was clear they did not understand and did not want to understand.
In general I rarely give FP advice while at DLR or WDW because the typical body language and facial response I get is "don't talk to me, I do not want to hear it". Every once in awhile I will mention some FP tips to people if they seem open to talking about it. But usually they are not open in my experience.