And this is why the players that own the GB's should have the power and ability to be able to accept or deny FP contributions from players. Many guilds have contribution groups to help THEIR members level up and collect BP's they need and the snipers disrupt a players right to run their city the way they choose. Leaving that 1 point just makes you a greedy scavenger.
I don't think that makes snipers greedy scavengers, it just makes them smart at their craft.
To me, the whole risk of the GB's is what makes it fun and interesting.
This game is run by FP's and who has a large amount will go far.
You can have a city full of event buildings bringing in FPs and you can have FP GB's at a high level bringing in a good amount a well.
However if you are an active sniper you can bring in many more times your city collection just by doing your homework going through the hood and buddy list (If you have it set up correctly)
Your biggest resource is time, if you are willing to put in the time to look then you will do well with GB snipes.
Now there are players that know how to defend against the sniper and that is great, but there are so many more that either do not know, or just do not care.
They are casual players that log in once, twice a day they load up all the FP's they collect on one GB and next time they log in they are hoping spots 1 and 2 were taken. Nothing wrong with that, if that is what makes the game fun for them its all good.
I have found some players that I get huge snipes on and then at some point they became aware of how to actually work the GB's. They might have been a casual player maybe they just joined a good guild that showed them how a 1.9 thread works, and then it all changed for them.
No matter what anytime you put FPs' on a GB its a risk:
1. They may never level it.
2. if you don't check your math you may get jumped. (always double check)
3. you may add at the exact time as someone else and come out on the losing end. That always sux and usually a huge loss in FP's.
As I said before I like the risk of sniping, what fun is it if everything is rainbows and bubblegum ?