Passive coin production is incredibly slow and an issue especially when people leave and your team is down not only a player, but resorces too.
Tnt makes building good defenses irrelevant, to a certain point, late game a four by four wall of concrete is nothing against a guy with two to three tnt. We need more blast resistant blocks.
For any player with reasonabe pvp skills this is easy to get, and even people who tacticly save for tnt early can opt for it instead of armor upgrades.
Bow spamming is an issue, yes, but the tnts ability to render well thought out defences useless in seconds makes rebuilding a huge money sink, and no one really bothers, i end up being the one who does all of this and repairing in every match. Its way too easy to spam.
But with better coin production, and something less prone to being blown up, like black stone or any other strong blast resistent block that will still break but hasa chance to withstand it.
Defenses will be much more viable late game against players who know what there doing, and spam tnt.
Example of upgrades: team based: coins per kill +? Coins generated naturally per second +?
Cost of items - ?