Guild Wars 2

Allow upgrades to gather funds from multiple players. You could even make it easy and make a button for a contribution of 5 silver and a small progress bar towards an upgrade. Once an upgrade reaches full contribution, it’ll queue. Incomplete contributions will remain on the other upgrades until they’re ready, and you can lock people out temporarily.

I’m tired of paying 1.5 gold out of pocket for fortified walls, and I’m sure the entire other 4 players who care enough to buy upgrades hate it, too.

Agreed. Spent about 6g on upgrades to keeps and towers the other night only to watch the enemy morning zerg roll them over and push us all the way back to Garrison in our borderland the other day. I was the only one with any kind of money on, so I was doing about 90% of the upgrading. Asking for donations helped, but that only made up for maybe 1g tops. Kinda sucks that farming that other 5 gold took me a couple hours the day before, and I’d farmed it specifically to upgrade keeps and towers.

Ended up getting so disgusted I haven’t logged in since =/

Agreed. I would also be more inclined to pay in Badges rather than silver or gold.
Like those PvE events where you give the NPC apples or something, players could take a tower then hand in <insert WvW related thing like toenails or claws>, bar fills up, NPC upgrades once the bar is full.

Edit: If there was some form of gathering DE to upgrade, people might actually work together to upgrade and be in the vicinity of the tower/keep for defending instead of just capping and zerging to the next point.