If someone is a member and asks for advice, other members are more likely to take the time to respond, even if they are very busy.
If I place a rental ad on the Last Minute Board and more than one person wants it, I will give it to a member over a non-member. I worry that someone who is too "cheap" to pay a $15. membership fee to support the TUG community, may try to nickle and dime me over a rental transaction.
There's just more of a bond and trust when you see that someone is a member.
Interesting take on it. I've not noticed longtime guests ignoring requests for advice.
I simply have a policy of not paying for internet content that began long before I ever had any knowledge of TUG. If some feel that this makes me look cheap and difficult to work with, I can live with it. I've done business with enuf people on this board to not worry about my rep based on my member status.