Do you plunder every hoodie that contributes to your GBs in large sums for a reward but knocks out your guildie..?
Whether they donate large sums, small sums or no sums to my GBs is irrelevant. I plunder them if I feel like it unless they send me a friend request and aid regularly.
Unfriend your friends that do the same...?
I only unfriend friends that don't aid regularly. My GBs that are progressing are either in a GB club, in a swap or I am leveling them myself. If a guild member were to complain to me about such a thing, I might, but it hasn't happened yet.
Or do you teach them to lock in their rewards.....?
Most of my guildmates have been around the block a few times, so I don't have to teach them anything. They have their own methods playing/donating when it comes to GBs, and they
all have the same guild mentality that I have, at least in the guilds I lead. I do give them advice if they ask, or if I notice something about their game playing or city that stands out as needing some guidance.
Better yet, lock them in yourself if you wish to protect their investment. Is that your responsibility....?
I believe in putting my money where my mouth is, so I have done this multiple times. Either by myself (once almost bankrupting myself buying FPs with coins) or by orchestrating a group effort. Sometimes on the GB of a guild member that left the guild, and sometimes when an outsider threatened to steal a reward position on a GB that a guild group was working on together. Nothing more satisfying than leveling that GB just after the outsider was passed for the 5th and last reward spot. High fives all around!
Speaking of guild mentality, I will also provide goods (if I have them) to guild members at a tremendous discount to assist in GE, research, building GBs, or whatever else they are trying to do to improve their city. I will also search the market for the goods they need and make the trades that I can to try to fill their trades. I am not alone in this in the 2 guilds I lead. In one of them, a guy that mostly self levels his GBs noticed that another guild member had fallen behind on leveling his attack GBs, so he took him under his wing. Gave him not only contributions to his GBs, but mentored him on game play. And I found out about this mostly after it had been going on for a while. Now
that is the kind of guild member I want, not the one that will snipe a reward position from a fellow guild member.