36 gold per starting wave really isnt that bad. If you get 40 gold every 30 seconds and your opponent doesnt by the end of a 20 minute match you would have made 2k or so more gold then your opponent which is decent. Now, that is assuming no reinforcements get upgraded - which really never happens.
2k, really? That's chump change. Seriously. And you're assuming you kill EVERY SINGLE CREEP (towers kill most of them) and that they kill NONE. Is this reasonable? Not in the slightest.
Priests provide 33g each.
And no one gets them until it's necessary. The creep upgrades are bought in burst, not gradually.
So by the end game, you will be getting around 635 gold per wave! 10 minutes of giants give you roughly 12k gold, and your saying you cant farm your way back into games.
If you're seeing giants, you are not living 10 more minutes. If you do, you win, but not because you farmed your way back into it, it's because you either both have giants, or the enemy is incompetent. At this point it's a creep clusterfuck, and they're taking portals. It's end game. You are not farming anything.
Why do you think early priests can so easily lose you the game? Because the opponent will be getting more gold and exp then you.
Which is why everyone waits as long as possible before getting them. This is stupid in and of itself - you are PUNISHED for buying the upgrades. Regular creeps should be giving far more gold and the upgrade creeps far less (and less exp than they do).
Also killing demigods and killing creeps is not the only ways to get gold, there is also the gold mine flags, towers and citadel upgrades - okay currency I is a given but currency II is something which costs a lot yet gives you an advantage if you can defend long enough.
Currency 1 should be gotten immediately upon war score 3, it gives such a massive gold boost it's suspiciously unbalanced. The others are ignored. Gold mines give crap, and aren't even consistently around all maps. That's why they're almost always paired with the artifact shop.
You also should never forget to consider that in order to make a Demigod kill you have to invest some gold in potions or consumables unless your enemy fails badly
You invest in team work, usually. The net gold for your team with several assists is staggering.
To summarize - the base creeps still give much less than just standing there. This is wrong.